I’m pretty torn on this, because it’s usually semi-creepy guys trying to buy a drink with expectations of attention paid to them later on, which nope nope nope. On the other hand, the last time someone bought me a drink was awesome. I was meeting a lady friend for drinks, he overheard us talking about rockets/Elon Musk, jumped in excitedly to contribute and realized quickly we weren’t interested in his butting in, returned to his own drink, eventually left, and when we went to close out with the bartender told us he had picked up our tab. So, win! Free drinks with no expectation of anything following it.