I think Apple's policies are indefensible and hugely anti-competitive, so on one hand, I like that this sort of sticks it to them. But on the other hand, they'll use this as justification for how they're not anti-competitive despite being based on technology Microsoft has nearly a decade of experience in and spent millions of dollars building. This isn't a solution for every developer and forces them to rely on a different platform holder anyway.
I also don't like that this was an exception made just for Epic. Microsoft says they want to do this more, but starting with Epic feels very backroom deal. I'm hopeful, though, that Microsoft will expand this policy to all free-to-play games. Allowing consumers to stream these free-to-play games is very consumer friendly and gets them in the door to see how good Game Pass is.