If you are a resident of California, the state now has a portal where you can demand deletion of your personal data from 500+ registered data brokers with a single request form, for free.
https://hachyderm.io/@evacide/115823137786391729
Note: aside from this thread, there is also further discussion in the linked Mastodon toot.
Fine them $1 million per day per person who still has data on their site if they submitted the form.
Really, these types of services need to be opt-in instead of opt-out.
They need to not exist.