how are all these westerners who do vlogging and stuff full time staying in china legally?

i see so many life in china influencers who never seem to mention having an actual job or anything and i cant help but wonder how theyre even staying there without a work visa or anything? and even if they do have a secret job they never mentioned how are they able to benefit from all the youtube income when it would be technically illegal on a work visa (i believe?)? so many questions...