What do you mean by clear alternative? Feature parity? There's at least 10 nearly feature-compatible software out there. I can name five without looking it up: PeerTube, LBRY/Odysee, Cinnamon, Nebula (okay this one's a bit of a stretch because you can't outright sign up and post videos, you need some creator to invite you), DTube.
Thing is none of them will make you YouTube money, so smaller creators don't bother, while larger ones usually just cross-post stuff, leaving no incentive for their audience to bother with the alternative.
Thing is none of them will make you YouTube money, so smaller creators don't bother, while larger ones usually just cross-post stuff, leaving no incentive for their audience to bother with the alternative.