I think this is a really good question. Let me offer one possible answer:

It might not be necessary or useful to have multiple aggregators right now. However, I do feel better knowing that if Bluesky the company goes under or changes to a degree where I'm not happy with their decisions, it's possible for someone to stand up a second aggregator.

For that matter, if someone's a free speech absolutist and if they care enough about it to spend the money, they could stand up an aggregator right now with more permissive standards.