The #slopocalypse is the result of the gamification of the OSS development. It just feels good to land a PR, especially on a popular repo. Combine that with the ughm less experienced devs' proneness to overestimate their achievements, and the ease to half-bake something that looks plausible enough, and you get the explosion of low-quality slop. Something similar happened to, say, youtube or facebook, but there there was at least some financial incentive