But that is a double-edged sword. What if, for example, mastodon.social doesn't defederate with Meta, but you defederate mastodon.social? Now you've just cut yourself off from a huge portion of the fediverse. Admins should defederate from Meta if their community wants to do that, but defederating from other instances that didn't do that is going a bit too far, in my opinion.
Or you can use duckduckgo that uses bings search index while protecting your privacy