Comment by Merman_Mike

+1 to the second suggestion as a low-effort way to make some headway in staying off blocklists.

A place to start might be this large, very popular list that combines a bunch of other lists: https://oisd.nl/

Actual text file is here (large file warning): https://hosts.oisd.nl/

Just prevent your service from shortening links to any of those domains.