They probably didn't get the sarcasm of your videos and didn't like being made fun of. Or maybe their sponsors didn't like it, or both.
One final thing that bugs me about the ShoeTubers is that they make big events big but local races are still struggling four years out from the pandemic. It's a lot easier to run your neighborhood 5k than to run Boston. I wish they'd focus more on that. Ironically, those that do seem to be getting the most views.