npub1jnhp9dqvwn8pjwccrkh8p3rhp3h465fvye7ks7vqxsz4r2qvtc2scrlfd7 (npub1jnh…lfd7)
That's a good question. I expect each instance will have defaults in place for their server, but your personal settings should give you some control over visibility to search engines.
I use duckduckgo for most things myself, and as far as I know the engine behind it is sourced through Bing/MS. It's sad how we can't trust Google for anything anymore. I feel like they helped make the internet pretty great and now they are definitely not.