I'm here recently and did not fully understand how it works. Why do some escrow have 0% fees? Does this mean that they will not take money for their services? Thank you in advance.
It's because they just want to help those people to have a successful transaction so they offer 0% fees for their escrow service. They are known and trusted by the bitcoin community so any tip will do, that's the another term now for the fee though it's not actually a fee or payment for their service. But of course as a part of appreciation for their help, it's a good act if both parties will agree to give them tip voluntarily so that next time that you need them then you can have them.