I have seen a few do the conversion. They usually start by cross posting on any video site they can. X, Rumble, locals, self hosting, discord, with usually some sort of patreon model of funding with maybe ad reads. Then what is left on YT is highlights of their other longer form content on other sites. The kicker is they do not need as many people following them as YT is not taking the majority of the ad revenue cut.

But if you want to see people trying to make the conversion just scroll the front page of Rumble. Many of them are trying to get out form under youtube and many have YT channels too. But Rumble is just another YT waiting to happen and they know it.