It's pretty easy to jam as it's just radio waves. Increase the noise on the channel and the chirps of your msg don't get heard. That said there are some options to vary the channel as a group, and jamming a broad and robust mesh completely vs an area of nodes is a bit harder.

Trackable as in traceable? You mean finding your node location? By default not overly difficult but again, can be set up to make it hard to find you.

Riots are better coordinated when people can communicate wirelessly

A government can shut down a riot of 10,000

It struggles with 10 1,000 person riots.

This is a non answer. yes, hypothetically they can, but the whole point of finding alternative channels is to make it difficult for them to do so, to the point that they might not even try.

That pessimism of "they can jam it anyways" is like saying do not wear a helmet while riding a bike, if you are meant to die that day, you will die regardless of head protection.

Plus, it will take resources for them to jam things, and the more resources they need to do that shit the faster it will deplete them and the less they can do, it is so obvious I do not know how to write it without sounding demeaning.

Maybe so, but incompetence is persistent within fascist organizations, and it adds an extra problem for them to deal with, which has value for that fact alone.