I know this is a stupid conversation, but I can't resist.
You've introduced bias in the way you set up the question. By having the first two answers "no," you've given the people a mental set which they use to answer the next question. It's a well-known effect that most pollsters or questionnaire designers are careful to avoid. A sequence of "no's" predispose (not determine, just predispose) people to say "no," and a sequence of "yes's" predispose them to say "yes." So, you set your poll up in a biased fashion.
Compare with this sequence:
1. Is playing with trains a hobby? (yes)
2. Is playing chess a hobby? (yes)
3. Is playing videogames a hobby? (yes)
In fact, the "Well..." you got signals that the participants saw that there was something different about videogames, that it didn't match the first two examples.
Let me ask you this.
Back in high school, you're taking a test that you feel you didn't prepare well enough for. You come to a True or False section of the test and think "Oh thank God!". Now you're chipping away at a sequence of questions that you've answered True to. Would you say that you're predisposed to answering True to the next question, or would you think "I've answered True to the last X number of questions. This one has got to be false."
I think a variety of other factors (cadence, tonality environment etc), of which I didn't explain, influenced whether my audience of three were predisposed to answering my third question as either "Yes" or "No".
I notice that you've gone from complaining about a word being used (properly) to complaining that a standard definition of that word is inadequate.
I don't think I've changed my stance at all. I cringe when people say gaming is their hobby because I don't think gaming is considered a hobby. I don't think I ever validated that the word was used properly. Help me out here if you have the energy. (My keen sense here is telling me that this conversation has reached its half life)
Look, you can always find fault with a simple definition of a word. Definitions aren't supposed to be exhaustive analyses of a concept from every possible angle, covering every contingency. They're supposed to be brief, simple descriptions. A dictionary would come in a 100-volume set, if every concept had an exhaustive description and analysis.
I don't think most definitions can be picked apart as much as the word hobby has been defined here. I find most definitions to be satisfactory for the most part. Leave gaming out of this for a moment. The definitions provided by Frozpot are blatantly insufficient.
Ask people what they think the definition of the word hobby is and they will say something along the lines of "An activity that you do in your spare time for enjoyment." Then you challenge those people on that definition by saying "So smoking cigarettes, according to your definition, is a hobby?" 10/10 times they will respond with "Well, no but...um...let's see a hobby is..." They always attempt to redefine the word. I don't think the definitions to most words can be challenged this easily.
That to me suggests that the word hasn't been defined properly.
I think what the above definitions have been missing is an inherent beneficial nature to what a hobby actually is. I can picture a concerned Mom, walking past her sons messy bedroom while he plays games for hours on end, saying "You need to go outside. Get a hobby or something." The word, to me, is always mentioned as a positive. I don't think society views this activity as adding to the greater good.
You've still not offered a better alternative, btw, which suggests to me (surprise) that you're not really interested in finding a solution, just debating for the sake of debating.
A hobby to me is an activity that one actively participates in during their spare time, that allows for growth/new understanding, and benefits the participant/community in some way.
NOTE: To everyone involved, you could stick a lie detector to me and ask me "Do you think the PS4 has a better 2016 lineup than the XBox One" and I'm answering yes without a blip on the graph. I know that for a fact. With this, I'm much more inclined to believe I could be wrong. I know it's not coming off that way but I could be persuaded here.
Anyway, Andy, great post. Posts like that, or the potential of reading posts like that, are the reason why I come here.