While I can't make useful comments on protests or strong anonymity, wrt photo metadata, I can say that I scrub metadata from photos that leave my possession, as a matter of course, using 'exiftool'.
Here is how you read the existing metadata:
exiftool -a -u -g1 IMG_0708.JPG | more
... and here is how you scrub it:
exiftool -all= IMG_0708.JPG
(you could read it again, after scrubbing, to demonstrate it is gone ...)
ImageMagick's `convert` also supports stripping such metadata, the flag is -strip.
I nearly always scale+compress photos that leave my possession, and usually using convert, so adding -strip is a nice streamlined way of doing all at once.
Here is how you read the existing metadata:
... and here is how you scrub it: (you could read it again, after scrubbing, to demonstrate it is gone ...)