The
stuff they did in this particular case is likely a violation of all laws involved, just like the other recent case with the US Secret Service in New York City. In both cases they are seizing someone's business equipment, on the assumption that because it is an unusual business and sometimes it is used for spam, the business itself is spam.
Actually, it's probably legal in the USA, but completely illegal in the EU where the Digital Services Act regulation very specifically says that a mere conduit of data transmissions cannot be held liable for data transmissions passing through it which it didn't originate. I only know anything about the law in Germany (and I am not a lawyer) so let's pretend this happened in Germany - then the business operator - presuming that they're running a relay business and not spammers themselves - would win back all the money this police action deprived them of, including lost revenue, equipment costs, lawyer fees, and repairs for any damages incurred during the raid. Their cellphone provider is probably allowed to terminate their contract however, and could sue them if they had any meaningful damages. The civil court system here is very algorithmic as far as I'm aware: if(you broke the law) you.transfer(victim, victim.money_if_you_hadnt_broken_the_law - victim.money);