Can you elaborate on this? I want to know what the concerns are.
Obviously, they can track you with cell towers, and there's the legitimate risk that they're setting up stingray cells to intercept or even disable communications. All of that sucks, and I wish it weren't a problem.
However, if I'm participating in a non-violent protest, I do take a bit of a "flood them with noise" attitude by just being there. I also want to be able to contact my group in case we get separated. Burner phones feel a bit like overkill for what should be a non-violent protest.
And yes, I know there are problems with my "nothing to hide, nothing to fear" attitude. I'm not trying to advocate for that. I want more information so that I know why I should be worried.
It is disappointing to be reminded that "innocent until proven guilty" is not the shield we were taught it was.