This fork integrates sponsorblock, been using it for a while and even though the maintainer calls the integration "rather basic" it works quite well.
https://github.com/polymorphicshade/NewPipe
I'm really glad YT Vanced did integrate it.
What's the difference between Vanced and NewPipe?
Vanced is a mod of the stock YT app, NewPipe is a completely new codebase that doesn't use YT's API.
How does it get the YT data if it doesn't use its API?
The way your browser can watch YT.
Newpipe is Libre Software, Vanced is not
It would be weird if it didn’t considering its name is “Youtube Advanced without the ‘Ad’” :)
Yeah, just read through the GitHub issues thread and it's rather flimsy justification for not implementing it that seems to boil down to "because I don't want to". A real shame, since I'd always admired the project.
"Because I don't want to" is a perfectly valid reason to not implement something in free software.