this is a likely side effect of selling user data to data brokers or data co-ops, where companies sell individual user data to a larger user database that's accessible to all companies in the co-op or that pay for the data broker's services.

an interesting case of 'who owns what' in terms of user data. You created the data - does that mean you own it? does it mean you should have a right to delete all record of you or that data for a service?