It does. The problem is that crooks aren't generally trustworthy, and selling you out is leverage they're very willing to use should the cops ever catch them. The same applies to every part of the illicit communications network you rely on - if any part of the trusted chain breaks down in a way that enables the cops to subvert your encryption you're screwed, right down to installing an OS update on your device.

Good opsec is exceptionally hard. If you aren't building it from scratch it probably isn't secure. And even if you are, if you're a big enough target for nation states to be looking you're still going to have a hard time.