Adversaries have access to this technology too, and it's a power multiplier. If they can shut down access to those they are oppressing, then they become far too powerful.
Yes, protesters can still protest, but without access to the same tech that those they are protesting can use, they can be out-organized, their voice muted, and their effectiveness minimized.
That would not be the case in this instance. You (the protestors) would be back to runners, unencrypted radio/code. They'd still have the modern comm suite.
It doesn't make things impossible for protestors, but it greatly shifts things in the government's favor for containment and ability to sustain itself against a now unconsenting populace. Always remember asymmetry will be employed as early and often as possible.
People survived hundreds of years ago without electricity or running water, so it should be perfectly fine if the government shuts off utilities for protestors, right?
US Population, 1870: 38,558,371
US Population, 2020: 331,449,281