Feels like criminals will eventually get encrypted communication right and there won’t be anything left for police to do.

Vast majority of criminals are actually stupid though. For every criminal using quantum guaranteed encryption there will be 10 just doing normal unencrypted calls over regular GSM - you use the same tactics against criminals that have been used forever, before IMs were even invented - you infiltrate these groups, arrest lower members, get them to incriminate the people higher up until you dismantle the entire structure. Yeah I know it sounds simple and in reality there are million other steps to do this - but it has been done in the past and is still being done now. That's what the police will do. They caught criminals before they could read their messages, they will catch them again when they can't read their messages.

What makes you believe they don't / didn't already? That's the thing, if it's done right you'll never know until it's found out and decrypted like what is in this article.

Encrypted communication is already a solved problem. The people being caught are the ones who don't have the technical skills to use them correctly.

Then they'll refine stenography and it will be citizens who suffer increasingly more.

When you have tens of thousands of criminals using a single app, the reward of cracking that in some way is gigantic, and these apps are created by a team of a few people which can't cover every angle like Apple can.

If the marketing is to be believed we are months away from having AI assist someone with no dev, technology, devops background just asking for an app like this.