Honestly, I do not understand why one should use this. I have recently seen some high quality YT videos, each of a length of 30-60 minutes. In those videos where some sponsors mentioned which took only one or two minutes. Seems perfectly OK for me to support the creators. I guess if many people block sponsor content, this kind of vids will die.
Also, checkout NewPipe with built in SponsorBlock functionality:
https://github.com/polymorphicshade/NewPipe