Ok, like selling gasoline to the getaway car driver?
Your analogy is terrible and doesn’t make sense.
If you provide a service that is used for illegal behavior AND you know it’s being used that way AND you explicitly market your services to users behaving illegally AND the majority of your product is used for illegal deeds THEN you’re gonna have a bad time.
If one out of ten thousand people use your product for illegal deeds you’re fine. If it’s 9 out of 10 you probably aren’t.
This logic clearly makes the prison of someone like the owner of Telegram difficult to justify, since 99.999% of messages in telegram are completely legal.
This really isn’t that complicated.
Keep in mind that as soon as you store user accounts you keep user data, which is perhaps a trivial form of eavesdropping, but clearly something law enforcement takes an interest in.
You’re making the opposite point of what you intended.