There was some thing about NewPipe not liking that they used the NewPipe name in the app name and a logo that resembled a bit too much. The NewPipe x Sponsorblock dev decided to rebrand to Tubular and everything is as you expect it otherwise.
Unfortunately I don't have time to find the issue right now, but it was discussed somewhere in their repo.
It's from the same dev. You could see it as the natural evolution of newpipe. So far the only difference it's the possibility to submit sponsorblock segments with tubular.