I doubt we will see much more from Mobility Mary. Older people still get ashamed unlike the people under 35 or so, so now that she knows people are paying close attention she will try to hide. It was probably a young relative who introduced her to YouTube. I doubt she is on total government support because it's not like Whole Foods is cheap, so she's either on a dead husband's pension or she has some trust fund set up for her. Her neighborhood is pretty decent for L.A., so it's highly doubtful disability income paid for all of it.
Your Mumkey stream was excellent, even though I had never heard of him until recently. YouTubers who spin out of control are fairly common, it seems, so nothing that happened to him was surprising.