I think if we are going to support the idea of an open web, we need to be consistent about it. Federation should be possible with threads and blusky. One of the main advantages of federation is that it is interoperable.
But we have to be careful. When you have an agent as powerful as Facebook/Meta at the table, it only takes a few missteps for the fediverse to crumble. I don't think Mark Zuckerberg has had a sudden change of heart, the success of the fediverse is not his goal.
There need to be clear requirements for a platform to be allowed to federate. Basic rules like not manipulating engagement metrics and respecting the protocol. But we need to think as a community about where we draw the line.
Personally, I think user mentions from thread users opening the threads application is a huge violation. This behavior is not expected, and is only meant to suck people into their ecosystem. It shouldn't be accepted.
It'll be a long road fam, but I think it's worth it for a better Web.