"EAC supports Linux, but devs just won't turn it on" is the clickbait answer, but the details are more nuanced. EAC has multiple security levels that a title can set based on the threat model of the game, and most games with heavy MTX that use EAC shy away from it, largely because Fortnite doesn't do it. EAC is owned by Epic, and if Tim Sweeney says that you can't do MTX on Linux safely, then any AAA live services game with in-game MTX is going to shy away from it, regardless of how true the statement actually is.
I don't know if this is a fever dream or if it actually happened, but I seem to recall reading something about Tim Sweeney using Linux for a week to see how it compared. If he liked it, Epic Megagames would publish titles w/Linux support. He ended up complaining about some irrelevant things in KDevelop and it was pretty clear what his intentions were before even trying things.
I can't find any reference to this online, but I'm pretty sure that it happened. This would have been ~1998.
