Is it, though?
We don't know what Mythos is really capable of, beyond what Anthropic has told us, and some second-hand accounts from orgs that have been whitelisted.
What we do know is that their withholding it from the masses is causing a lot of harm to their reputation and general annoyance. And probably a lot of money as well, as those people cancel their subscriptions in favor of other models. They are about to IPO, and you don't want people to have a bad taste in their mouth during this critical period.
As such, I think it is reasonable conclude that there must in fact be very valid reasons for them to keep going down this path of gradual access-widening. I'm never going to blindly trust a corporation, but in this case I'm not going to hate on them either because, at the risk of repeating myself, we just don't have all the facts.