Has it ever been demonstrated that these bans actually hinder terrorists or criminals?

It does feel like they would just move to the next app/protocol or even roll their own or use VPNs... so why are governments still penalizing 99.9% of the population which use these only to communicate normally (and use privacy protocols because they don't like the idea of being surveilled)?

Are governments trying to funnel non-criminal people towards apps they can surveil completely to be able to control them even more? To what end?