So you don’t ever want to learn about new things? And even if you did, you wouldn’t want those new things be efficiently suggested to you and instead be bundled with a bunch of other boring crap?
Also, what you’re asking for is what the tool seems to do. You would put the slider all the way to one side to avoid having new stuff suggested. Existing social media platforms often just shove stuff at you endlessly.
What is your goal? Custom stuff isn’t too hard if you just want to implement basic password login and token-based auth. Otherwise you could use something like Firebase, Okta, or Cognito.