Let’s stop voting for Democrats that’ll fix it
I think a whole lot of that comes from right wing bots, just like the whole astroturfed "Walk Away" campaign back in 2018. I wish I could attribute it completely to the right wing, but I'm sure a lot of edgy leftists are doing it too. The arguments are terrible, but some do seem to genuinely buy in. Somehow the answer to "Democrats bad" can't be "Replace bad Democrats with good Democrats".
It's funny though, none of them seem to have a plan for how to prevent their new party from being similarly overrun by greed. If they somehow managed to overcome every organizational challenge to get a massive voter migration away from Democrats and to Whatevercrats, they would have to somehow vet the intentions of hundreds or thousands of candidates who never held office before. These are largely the folks who promoted Tulsi Gabbard and Jimmy Dore long after their grifts became obvious.