Welcome to Lemmy! Just by being here you’re about to find out (whether you like it or not!) just how viable it is to replace (almost) everything in your life with open source alternatives, it’s just seems to be part of the (awesome) culture around here. Enjoy!
I would usually tip based on the total including free food. So if the total was $20 I would give 15-25% - probably 3 to 5 dollars. In the case of getting just a free drink, I usually tip the price of the drink, similar to what you mention.
Welcome to Lemmy! Just by being here you’re about to find out (whether you like it or not!) just how viable it is to replace (almost) everything in your life with open source alternatives, it’s just seems to be part of the (awesome) culture around here. Enjoy!