That is the real (overall) goal of shit like this.
Prevent people from using communication devices so that we can’t coordinate. It is a lot easier to go around busting heads if people aren’t recording you (or running over from the other street to fight back…). Same with the constant war on encryption.
And useful idiots (or incompetent plants) will love to talk about how the real problem is people are bringing those evidence collection boxes to protests and are coordinating rather than acting as a sea of individuals.