Is there proof to show otherwise? I think more and more gamers are multiplatform these days. Just going by what I see and read around.
Heck, do a poll right in this very forum. I bet there are a lot more multiplatform owners than you think.
Found a NPD Analysis that over half of US gamers are multiplatform back in 2018
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Ownership of multiple game consoles is up too. The share of all players ages 13 to 74 who play console games is about the same in 2021 as in 2019—36 percent vs. 33 percent—however, the density of ownership is considerably higher. Hub found that in 2019, just a quarter of console gamers owned both a PlayStation and an Xbox but in 2020, more than a third of respondents said they own both.
Edit: found a better study
Detailed PC & console gamer demographic and persona analysis: In the last six months, two out of three gamers played on a PC or console and
72% of PC and/or console players used at least two platforms. The market also became more equitable in 2022, with women gamers accounting for 40% of the total PC and console player base.