Dead-simple escrow service without arbiter?

I've been looking at a lot of complaints lately about s*x workers that require a deposit before meeting their clients in the US, because they risk losing time and money otherwise. Clients, in turn, complain that making a deposit frequently results on them losing money to scammers, even with due diligence.

I can think of some reasons for why they aren't using decentralized escrow services:

1. Complexity of setup.
2. Need to trust an arbiter.
3. Platform keeping incriminating information about them.
4. High fees from platforms wanting to profit.

Is there a platform that solves these problems? If not, what would be the technical hurdles to setting up such a service?

Here is how I'm thinking this service should be setup:

• Item 1 could be drastically reduced with a dead-simple and intuitive app design. Literally a couple of buttons and that's it. The whole app is designed to solve one specific problem and nothing else.
• Item 2 could be done away with for the sake of speed and simplicity with an automated intermediary wallet. Funds get released by John if service is rendered, otherwise they simply get locked forever. No dispute resolution means money lost if service isn't rendered, but at least scammers won't stand to gain anything, which reduces the problem down to just trolling, likely less prevalent than scamming.
• Items 3 and 4 could be solved with a decentralized not-for-profit service. No company incorporated, just open source code floating around and an app.

Thoughts?