If the tool they use to make their game requires customers to install malware onto their machine you can't really blame the customer for avoiding software that is built with said tool.
https://www.gamesindustry.biz/unity-ironsource-malware-came-...
https://www.pcgamer.com/unity-is-merging-with-a-company-who-...
Not allowing developers to remove it from their games would certainly be a step too far (at this time anyway, who know what will they come up with in a couple of years).