Earlier quoted context omitted.
Like running around trying to zip tie protestors around their bodies? Plus it’s a little expensive for a 1 time use.
If there was a way perhaps to restrain the protester(s) in such a way that they can remain upright, present and vocal; but immobile, I’m confident that it would be so effective that law enforcement would be criticized for using anything but these apparatuses. Cost would not be a deterrent in this case.
When people complain about protesters getting in the way and being noisy and generally being inconvenient, they are bemoaning effective protest. That's a constitutional right.