But have not yet submitted any KYC documents or my bank info, nor tried to make any trades, etc. Just my email validation and cell number (for 2FA). I have never used an exchange before
you're in the states, right? before you do anything else---do you have a REAL ID? if not, don't bother. they won't verify you.
Most of my BTC is thoroughly mixed/tumbled/CoinJoined. I do not have LARGE amounts of BTC, but not trivial either. Am I likely to have problems "cashing in", say, 0.2 BTC (wire transfer to my bank account once in a while) with mixed BTC? I read about many people having problems with exchanges giving them a hard time about "issues" (most seem to be related to KYC issues, but perhaps some re "tainted" BTC). I am OK (sort-of OK, don't like it, but I'll do it) with going through the whole KYC rigamarole, I have done that elsewhere, but what might I expect from Gemini?
gemini does mention mixing/tumbling in their terms. it probably depends how your coins were mixed. there have been multiple public instances where coinjoins got peoples' accounts flagged at other exchanges---not so much for centralized mixers.
gemini doesn't tell people why their accounts are being closed, they just close them, so it's hard to say with any certainty how they approach the issue.
Do they have humans to talk to? I am likely to have various questions... I could not find any easy emails, for example, when examining Gemini's website nor Coinbase's. I went with Gemini (for now) because it was easier to figure out how to set up the account.
i'm not sure but according to their "contact us" page, you can open a ticket, call them, or DM on twitter for support.
https://support.gemini.com/hc/en-us/articles/204732835-Contact-usWhat is this business of "Source of Funds" all about? Is it an issue if I want to sell BTC? I have bought BTC pretty regularly in small amount since 2013 (and keeping track of Cost Basis and Selling Prices for taxation records. But, the money I have used all these years has been mine, what sorts of issues might concern Gemini about this?
it has to do with this:
https://www.gemini.com/legal/user-agreement#section-source-of-fundsbasically, they wanna cover their ass and make sure you aren't using illegally obtained funds or funds that aren't yours. they don't wanna be used as a money laundering instrument, or facilitate money transmission on behalf of anyone else but you.
if they don't like your answers or you exhibit some account activity they deem risky, i reckon they will close your account.