There is no paywall to access any addon or site, that is the point. Curseforge is completely free of charge to use as is wowhead, as is raidbots as is any addon or website related to wow.
Raider io are not doing anything wrong. You are incorrect. Nor is the wowaudit spreadsheet which works off the API. The number of updates you get for free are less than those if you pay patreon.
This is allowed, it is not against the rules you are wrong.