Check out the NexusMods case.
It should also be noted that most websites use Cloudflare, so if an error occurs in that system, most websites may be affected. Furthermore, using their system may cause a website to be blocked, and they may even block websites if someone orders them to, so using them on a client that uses ‘nostr’ is not a good idea.
Apart from the fact that the system they are using causes all videos uploaded to the client to be scanned for CSAM before being displayed, the problem is that this system is often inaccurate, causing it to hide content that is not harmful.
Apart from the fact that it can scan messages from the relay used by a user, causing false positives and sending messages to users who follow it, even though one may not have used that client and is scanning uploads made on clients that do not have it.