customers: imagine a 50 something, single, white male from jersey. he asks you for a new feature and you explain that someday when you have time maybe. he launches in to a full tirade about being a paying customer and lets you know his whole frustration with the consumer experience. he has never done anything but work for someone else but yet he knows for certain how you should run your business. he takes it very personally that you don't value his impossible opinion and starts to send you creepy emails. the more you ignore him, the more he persists. forget it about a legal recourse. cops could give a shit. sure you can filter his emails, but the fact remains you have some old male obsessed and taking out his midlife crisis on you. im not joking when i tell you i literally have 5 guys like that.
also hard are partner relationships or supplier relationships where you don't have any clout. the uncertainty of internet biz in general. knowing google could throw you a curveball and not give two shits.
finally, competitors act in completely irrational and destructive ways because they're competitive and they just want to win. they're so driven they'll drop prices to zero when you could easily coexist. always worrying about stupid crap like that.
it sucks but it beats working for a dumbshit. i just want to be so rich one day that i can say fuck it all. that is my experience and very much how i feel.