It’s not the expression of opinion that sinks a channel, but a pivot from topic-focused to issue-focused. AvE didn’t go downhill for getting frustrated about the pandemic, he fundamentally changed the focus of his channel.
It’s one of the things I appreciate about the better firearms channels. I know they’re probably unpalatably conservative (to my taste), but by largely sticking to a topic (rather than the multitude of issues that are doubtless important to them), they manage to reach a wider audience.