[snoman]

Are the hikers considered intrusive, or just the drones?

[greycol]

You'll hear plenty of hikers complain about hikers if they are also creating unwanted noise (usually from portable bluetooth speaker).

[palata]

Even sometimes it's annoying to be near hikers who just speak loudly. Sometimes you just want to be in the nature and enjoy it quietly :-).

[__MatrixMan__]

Some places you have to apply for a permit (few of which are issued) to make sure there aren't too many hikers at once. So I think it's both.