It's easier to get a domain added than removed. and for the "corruption"/"rackeetering" part, it's a "win-win" for the adblockers and the list maintainers.
Adblockers also often pay browsers to be integrated by default (AdGuard, Adblock Plus, etc), and then they negociate with publishers to whitelist some domains (not necessarily the most obvious, can just be analytics).
"We offer your domain to be unblocked on xx millions of devices by default, this will create you a uplift of revenue of +yy%"