1ºI always tip servers and bartenders an average of 20% (including for take out) because they typically do not earn minimum wage and rely on tips to earn a living. However, for quick serve and fast food restaurants where the employees are already earning minimum wage (or more), I typically WON'T tip them or may tip a dollar.
I really think it's unfair that, though, that companies who pay their employees the minimum wage (as opposed to the tipped minimum wage) are asking customers to tip their employees. If a customer wants to tip someone who goes above and beyond and provides superior service, that's fine. But don't make it a mandatory prompt during the checkout process.
2ºSome services I'm only just learning that tipping is expected. I'd tip everyone tbh but so many companies punish employees that accept them so I avoid putting them in a position where they have to uncomfortablely decline. I once had an old woman tip me $20 for carrying stuff to her car but she got pushier the more I said no. That was the first time I went against policy and it made my anxiety skyrocket for a month because I thought I'd get fired for sure. Tipping should be allowed everywhere if people want to tip and should not be a punishable offense.