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Re:URL shorteners set ad tracking cookies by Merman_Mike on Sunday January 03, 2021 @05:47PM (#25625976)
+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.

Re:URL shorteners set ad tracking cookies by rndomsrmn on Monday January 04, 2021 @06:03AM (#25629796)
You might want to consider checking for hosts listed in https://github.com/notracking/hosts-blocklists

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..)

Re:URL shorteners set ad tracking cookies by sjhgvr on Monday January 04, 2021 @03:48PM (#25637689)
No longer the case: https://oisd.nl/excludes.php
Re:URL shorteners set ad tracking cookies by llacb47 on Tuesday January 05, 2021 @03:13AM (#25643330)
Right on time, sjhgvr can't allow his rep to be (rightly) blemished on any corner of the internet.