Each unto their own, peeps. It's harmless enough.
At best, it's another way of sharing with community. At worst, it's a platform for arseholes. But that's the internet for you...
I've posted half a dozen or so bass playing vids to YT, and have watched many others. It helps me pick up tricky basslines of songs that my band will often end up covering, and I'm happy to give back with songs or basslines that I like from players I admire. I've had some moderate praise for this, but never any negative feedback.
Granted, I don't dress up like a drag queen or anything else outrageous. But I suppose performance and entertainment are parts of the job description of being a musician; the medium that people choose is irrelevant, and I suppose YT is as good as any.
Groove on,
BB