scales fine just depends how you use it 
'the concurrent number of users of Mainline DHT is from 16 million to 28 million' https://wikipedia.org/wiki/Mainline_DHT 

 SHA1 haha lol, man this tech is so old... i mean, it works but SHA1 is broken 

 also still used for git commit hashes... they really should do something about that 

 https://git-scm.com/docs/hash-function-transition 

 bittorrent is sha256 now 

 i would hope so! 

 but git is still SHA1 

 not really, there's a transition plan in place, and places like gitlab accept it already https://about.gitlab.com/blog/2023/08/28/sha256-support-in-gitaly/ 

 https://ichef.bbci.co.uk/news/1024/cpsprodpb/E934/production/_107000795_meme4.jpg