Considering some of your other posts, this view does not surprise me in the least, still it is black and white on several points, when the world is shades of grey. While cheating or going back to an asshole like Axel most definitely is corrupt or self-forgetting, your other points are very much a choice of what you do and not corrupt on their own.
Stalkfap is as corrupt as far as you decide to go and the "corruption grade" hinges very much why and what you do with it. Posting some "risk" bikini pics or artsy nudes on your own decision is about as corrupt as buying a packet of chewing gum!
"Having sex with anything that moves" might not be as squeaky clean as some people will want to, but a single or FwB Lena is not corrupt simply by the number of her sex partners. There is more to it than just this.
"Go under a perverted oligarch" is simply metagaming, since Eva "cast" Seymour as the main antagonist of the game, which he does not have to be. He could simply be a bored rich man dabbling in a new hobby and simping on Lena, as some paths of the game very much insinuate. Even Seymour and Lena hitting off from early on does not make her corrupt just so.
I think for something to be considered corruption in porn terms, 3 things broadly need to be met.
First: The character needs to undergo some sort of shift at the hands of some outside force. Of course the result will be sexual in nature.
Second: the character needs to initially believe what the end result to be as being bad. For example Lena initially thinks cheating on Ian is bad, but though the outside influence of Axel's wondercock, she does it anyways. At the end she may or may not feel bad about it, maybe she justifies it to herself.
Third: The player must believe the final result to being a bad outcome for the character or for characters affected by the actions. If the player doesn't see anything wrong with the final result of the corruption, then they won't perceive it as being corruption. For example if Lena decides to make a very slutty stalkfap because of he bad finances, a player who sees stalkfap/onlyfans as being a bad path for women to go down, for whatever reason, will see Lena as being corrupted. But if a different player doesn't see anything wrong with making a stalkfap/onlyfans and just sees it as female empowerment, then he won't see it as being corruption.
This line of reasoning is in an earlier message I said Seymour's path could considered corruption if he went down the blackmail path, but not necessarily if Lena was down with him from the start. Obviously I see one as being very bad and the other not really bad unless you want