I think you are almost completely wrong. While, sure, a lot of their following came from finding them in a normal, relatively PG environment...and the natural desire to see more that comes with it...many of them would have a massive following if they jumped to porn instead of AMSR.
You think a 18-20yo Glow wouldn't do numbers in porn? Lmao
Frivvy, tinting, Rose, Diddly, etc would have all been major names in porn had they never done anything before porn.
While, yes, we covet what we see and we naturally want to see more from those we've begin to covet, they aren't homely girls lol. They're hot. The reason they got big in ASMR was due to being hot, not the other way around.
Hot girls find success in porn lol.