As one of the comments above supposes, this may have been a misguided person thinking they'd be shielding themselves from 5g -- protecting themselves from cance

As one of the comments above supposes, this may have been a misguided person thinking they'd be shielding themselves from 5g -- protecting themselves from cancer that might be caused by 5g. Obviously the jammer would hurt them more, if energy at those frequencies does hurt humans (60W is a lot to put into a 5g jamming!). Such an intent would not be malicious. Another possible use might be to try to dissuade neighbors and phone companies from using 5g in the area. This would mean taking one for the team for a while until they give up. Except they wouldn't give up -- they would go find the jammer and get them arrested. I can't think of a legitimate use for a 5g jammer.