While the 95% figure is possibly correct when considering all games since the beginning of Windows, the remaining 5% includes most modern multiplayer games.

This isn't remotely true, it only really includes AAA "competitive" games. My solution here is to do without them; I would have probably bought BF6 had it supported Linux, but now that there are thousands of other games that work perfectly on Linux, it's a very minor loss. With Linux quickly becoming too big to ignore, sooner or later game studios will simply no longer be able to ignore that market. For now, it's only a few %, but it's growing, and still represents millions of sales. When lost revenue will exceed the cost of developing a compatible anti-cheat, Linux will be suddenly supported.