I work for a company that sales anti-spam and this is absolutely true. It is an unending battle between spammers and the people building the filters. We are also constantly getting RBL'ed by groups including Google and Symantec who know who we are as we have had business agreements with them in the past.
I would like to believe that the people who use those features would make the much simpler switch to Linux but with the new WSL and (ridiculous) terminal I know a lot of them will be persuaded to transition into the special hell that is Windows.