This is being coordinated and cheered on by users on enormous online platforms. If there was one or two fires in a single city or even state then I'd agree the FBI probably wouldn't even take a look.
However given the very public and national nature of these targeted events, they're going to have a plausible excuse to investigate this as domestic terrorism.
I'm not endorsing the FBI, or calling this terrorism, just stating how it's being handled by law enforcement.
That said, folks should know that even a small platform like Lemmy is crawling with glowies, be careful.
Segregated facilities are already illegal, including language about them in contracts is redundant, because contracts which compel illegal behavior are unenforceable.