Earlier quoted context omitted.
“Internet mob mentality” doesn’t exactly conjure a positive image. It’s interesting to see a case where it is genuinely, unambiguously a good thing.
It's likely that the "mob" who did this considers such action as a joke, they are not really people with good intentions, more like trolling intentions. Even-though the outcome here looks positive, I don't think it's any good. They could as well have bought gallons of oil and spilled it in the ocean if it had been a good joke for them.
This sibling comment deserves the most attention: https://news.ycombinator.com/item?id=26500831