Good point - what springs to mind for me was winning the
'Discovery of the Year 2021' award where I also got some funds from Sportsbet! I might actually not be able to sell them on a centralized exchange.
Yeah, that's right. You were one of the winners who got some money from Sportsbet. If you were to deposit those in Gemini or Binance.US (probably Coinbase as well), they would surely have some questions for you. Especially if you got those coins directly from an address associated with Sportsbet. I see no reason why Sportsbet would make any roundabouts and hide the origin of the Bitcoin.
I'm not sure if I understand correctly, but it appears Yobit charges 0.0005 for any coin.
Seems that way, yes. So that's around $11 at current rates. But there are also
reports like this one where the screenshot shows they are asking for 0.03 ETH for Ethereum withdrawals. Even after this recent drop in value, that's still $35.
For HitBTC it's even more interesting!
...
According to the same external website I quoted before though, it costs 0.0007BTC, which makes it even more expensive than the former exchange
Yeah, 0.0007 BTC seems to be correct according to
https://withdrawalfees.com/exchanges/hitbtc as well.
I'm not sure how decentralized they are though, if they have a simple website that you can interact with. This to me implies there are (centralized) servers that can easily be taken down or hacked.
You connect your own ETH wallet to the exchange. The exchange doesn't provide you with a deposit address. The danger is that one of the ways to do that is to import your private keys! That of course shouldn't be done. A different way is connecting with a Ledger hardware wallet. With the Nano, you don't import any private keys of course. I remember reading about a DNS hack a few years ago where everyone who used the fake site at the time had their wallets emptied, but Ledger users remained protected because of their connections through hardware wallets.