TL;DR - Yes, and companies should fix this by catching cheaters on the server, not the game client. Client-side cheat detection will always have gaps.

Server-side cheat detection is a lot harder than integrating an off-the-shelf cheat detection engine since it needs game-specific logic and likely more moderators to determine the difference between a cheater and a high performing player. It also requires more server resources, which also has ongoing costs.

Client-side anti-cheat is "good enough" for most studios, so they can get away with it. It's also often cheaper to not support a niche platform if the missed sales are likely less than the cost of ongoing support (or the opportunity cost of other lucrative projects).

I think that's really important to understand, especially when it comes to larger games like Fortnite supporting Linux, especially since most of those potential Linux users are likely already playing on Windows, console, or mobile. The profit is low, and the risks make it a hard business choice to defend. It's still stupid, but it likely makes sense from a business perspective.