Well ...
Charge-backs are not the only problem. I was seller/maker on another platform and had a guy hurry me to release the coins he just bought. I grew suspicious as it was his first trade and asked for ID. He asked me to return the funds which I did.
Weeks later our FBI equivalent I guess knocked on my door because of wire fraud. I had to explain to the general attorney what went on as she assumed I was a part of a fraud ring because funds of some victim were flowing into my account. Turns out guy's Facebook got hacked and the hacker asked all friends to do some urgent wire to my and other traders' accounts. Whenever somebody would bite, they opened trades with me and the others locking up our bitcoins with the platform.