A Western ‘clean’ Internet might start out as just keeping a select number of questionable tech out but I’m sure censorship will soon slowly creep in and control of that could end up in private hands not just governments, both likely with little oversight.
All this will likely do is restrict 'normal' users. Anyone vaguely tech-savvy will bypass whatever means they put in place. TOR, VPNs, a.n.other Next Big Thing. These aren't complicated.
You can't ban encryption. The knowledge is in the public domain, even if you were to magically make all encryption programs go away it'd be the work of minutes to recreate. It'd be like trying to ban French.
You could block transmission of secure traffic, and I wouldn't put that past a government who once thought that an IP address related to Intellectual Property. But that would be very, very bad. Like, banks crashing bad. And you can forget working from home.
There is a thing called "deep packet inspection" which can attempt to guess what payloads encrypted traffic might contain. But that is (both financially and computationally) expensive, it's plausible to do it for individually targeted users but to do it on a mass scale would require a staggering amount of investment.
