I used to be big into mining around 2012 and used coinbase to buy and sell btc all the time. I'm talking $1000 going in and out. I stopped the mining recently and have been using coinbase to buy BTC to help support the economy and buy regular items with btc. Just the other day I had a VERY close friend of mine if he could buy some btc using amazon gift cards so I said why not. It was only $100 to begin with. He gives me the cards and address to send to btc to and next thing I long onto coinbase and my account is closed because apparently that address he gave me was for a darknetmarket. Luckily no money was seized but I have zero commnunication from coinbase and would like to the logic behind closing such big accounts like this that didn't even know they were doing anything wrong. I know should never get money in coinbase but I figured since I was in a hurry I could just send it straight to them.
Circle closed my account due to this, which is why i always tumble since this. Been using Coinbase for about a month or two, been solid since. Friend should've knew to tumble to help you