This reply reveals the root issue. For a lot of people, games are not the same as porn videos, so comparisons fall flat. For most people, porn actress "characters" are meaningless and shallow, and we aren't making any decisions that affect them. AVN characters on the other hand tend to have fleshed-out storylines and personalities, and in many cases we've made decisions that directly affect how their stories play out. You see, a lot of people (like me) play games where they're making decisions for the main character by immersing themselves in that main character, while others (like you, which I assume from your post) play at a distance, not immersing themselves in any character in particular. It's also related to empathy. I don't like seeing unpleasant things happening to characters I like, because I feel some empathy for them, fictional or not. That you don't doesn't make you any more right, or me any more right. It just means you and I consume the content differently, and your post shows that you don't understand the people who consume it the way I (and a lot of other people) do.
As for NTR specifically, I dislike betrayal except when a person deserves it. Since I immerse in a main character, I don't generally like playing characters who deserve it. Thus, NTR affecting the main character's LIs is unpleasant. The main reason people who dislike NTR are as hostile about it as they are, is that it keeps getting shoehorned into games where it doesn't belong. Games where the MC is a good man, and there have been several updates with no sign of NTR, when suddenly a new character is introduced and starts stealing girls away from the MC. Thus, betrayal of someone who doesn't deserve it, and that same strong distaste, except this time it's about characters we've become fond of. The prime example of this is DMD, where everything was going great until suddenly a ton of emphasis and writing/development effort was shifted to the cuck story, with D wanting to fuck another dude, which felt like a betrayal for a lot of people.
A final note edited in: The poll is specifically about whether you would stop following a creator for these factors. People who stop following over NTR are just doing exactly what everyone wants them to do: they are choosing to not engage with content that disgusts them or that they dislike. No more, no less. Whether you would or wouldn't, you cannot have a legitimate complaint against people who simply choose to stop consuming distasteful (to them) content.