2. How are they legal ?
You're correct that law enforcement could theoretically identify what's being cached. The reason debrid services haven't been shut down en masse isn't because they're clearly legal—it's because:
So debrid services persist largely due to enforcement challenges and jurisdictional complexity, not because caching copyrighted content is definitively legal. The legal status remains contested.
Just because law enforcement could easily check doesn't mean caching illegal content is legally allowed. The opposite is true:
Why debrid services haven't been shut down despite this:
The persistence of debrid services happens despite the illegality of caching infringing content, not because of legal permission. They continue operating because:
The legal reality: Caching copyrighted content without authorization remains illegal. The ease of detection doesn't change the legality—it just makes the illegality obvious if investigated. These services operate in legal violation, not in a legal gray area that permits caching infringing material.
The fact that they haven't all been shut down reflects enforcement gaps, not legal permission.