This is pretty standard online though - even regular Google has settings like "Safe Search:On" that you can toggle to moderate your search results.
It really just depends on what the default settings are when you arrive at a service before you start using it, and how obvious and discoverable you make those settings controls.
Your default timeline view on Bluesky is just 'posts from the people you've chosen to follow, in date/time order'. That's the algorithm.
Everything else is optional and you can choose whatever other timelines or views you also want to see. If you only want to see the posts from people you follow then you don't need to subscribe to any other feeds / algorithms.