Thanks for you comment, would you tip an oncologist who gave you a second opinion for free? Nope. You would just be very grateful. - basically, this is a reaso

Thanks for you comment, would you tip an oncologist who gave you a second opinion for free? Nope. You would just be very grateful. - basically, this is a reason why it's called "Tipping culture", when you go to a restaurant you have a choice to pay or not pay a waitress there, and nobody can force you to leave tips, right? - But, usually people don't say, that the service was super nice and that's all :( normally they leave tips. Here, it's the same. Previously, you didn't have an ability to pay developers who helped you and now you have it, so it's up to you to pay or not to pay. It's all voluntary.