I honestly never encounter this? It's so rare for any website to flag me as using and ad blocker. I use Firefox and ublock origin which I assume to be pretty standard
Hello there, sounds like you're experiencing survivorship bias.
Its rare for you to see this, sure. Same for everyone else. But people aren't here to post screenshots of "look at this website where I didn't get flagged for having an ad blocker." So we just see a lot of screenshots where it is a problem, because that's what is noteworthy. There isn't someone out there getting flagged on every single website they open, we're just sampling a large population of user for only the websites where people do get flagged.
Why are we talking about this at all? Because it is becoming more common and more intrusive. This example is particularly egregious because you're already on the website to give them money. They're complaining to the user they they don't get to make money off of them while taking their money, which is ridiculous.
I think it'd be more correct to call this example selection bias but survivorship bias does not have to involve morality.
It simply refers to data which misrepresents the likelihood or severity of a failure state due to some failure conditions being excluded from the data. This leads to overly optimistic projections.