social media has always screwed over lgbt content creators. a few years ago, people found out that when youtube's family mode is enable, i.e. parental control, lgbt youtuber disappear from the platform. you couldn't search for them, if you went directly to their channels, no videos would show. this was something that showed at the bottom of the page whether it was enabled or not, but that was a previous layout, idek where to find that setting now.
lgbt people on tik tok are also always complaining that their videos will be taken down for breaking guidelines when it was just a video discussing an lgbt issue, when straight people will be borderline naked, showing the outline of their dicks and with their tits almost out, and their videos stay up.
but you are right that he fucked up with putting all his eggs in one basket. i guess he technically tried branching out, by doing photography/filmography on the side. but that always looks more like a hobby, not a second job. most youtubers have something else in the background making them money, usually some company they created or joined in, where they're part of the board and make a fuckton of passive income despite doing absolutely nothing and having 0 knowledge on how to run a business, they just delegate that work to someone else.
mark however, focused too much on just youtube, with a barely noticeable focus on photography, so now he's gonna struggle. if he's that passionate about photography/filmography, he could've opened a studio or something, now he'd be making money off the people who work there, while he's making random vlogs about nothing