Hm, well I've got to work out how to get off that list! Thanks for giving me the heads up.

EDIT: I'm not sure quite how to deal with being put on ad lists. Sure, people can upload any file to our host so it's plausible that someone, at some point, has uploaded an advert. Someone could also redirect to an advert domain and we'd have no way to really deal with that unless it was reported. Ideas are welcome for solutions.

Just some thoughts:

1. Reach out to the list maintainer to see why your site was added.

2. Create a blocklist comprised of those ad lists. Don’t redirect to sites on the blocklist.

3. (Of dubious practical value) Create a Terms of Service that says users may not use your to link to advertisements.

+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.

This is an excellent merged blocklist, with public whitelist (oisd is fully closed, no insight in what is whitelisted and why, also causing more false positives..)