In my corner of the world it's perfectly ok to photograph people as long it's a public space.
That might change from country to country though, due to different privacy laws.
Some are tighter than others.
Generally consent comes in if you're using the image commercially, other than that you're just shooting a public space where people also chose to be.
I don't think that by posting it here can be considered commercial use, as you're not selling anything. You're being rewarded/tipped for your content.
At least that's how I take it. I might be wrong though.
One thing for sure.. I never saw anyone getting any sort of trouble for posting such images on Hive.