Online I saw a guy with a power washer cleaning hate-speech graffiti for free (e.g. swastikas in the US). I don't think he does it for fame or clicks but even if it's a net positive.
https://www.youtube.com/watch?v=2OkGk2YRSnw
There's also an explosion of channels where professional landscapers and pressure washers do the occasional free job on a house in desperate need while recording it for YouTube. It's great background TV and likely more effective than any kind of paid advertising.
Think of all of the "I rescued this kitten from a well!!!" videos, only to find that that's the only type of video that channel makes, ie they're throwing kittens down wells.
I volunteered at an animal shelter that was not no-kill, because of sheer demand, sadly.
Of new volunteers, they ask "What's in it for you?"
Inevitably, "I get to help animals find new homes, etc."
However they'd say "No - that's what you'll do here. But what do you get out of it?"
And they wanted selfish answers. "I feel better about myself", whatever.
Because what they'd found is when things were a struggle, it was the "what's in it for me" that often pushed people to keep helping and volunteering, rather than (solely) "the mission".