I think you should insist that they return your BTC to you, no matter what it says in the TOS.
I do apologize, i am a bit of a noob at this, but is there any place you think i could submit a complaint and ask for that btc back from them, or is this a lost cause?
You can open the thread in
Scam Accusations, if you think it would be appropriate to warn others about the way you lost $900 +, or if you think it would help to get your amount back. It all depends on whether the Atomic wallet has access to the private key where your BTC are located.
I agree 100% with both these statements.
I also had a problem with Atomic wallet before. There was a bug in their wallet and I lost forked coins (about 0.004 BTC at the time). I talked to their "CEO" and they refunded me, as I was able to prove that it was a bug in their wallet.
Your case is different as the amount is much bigger, but I would try. If you can somehow attach their email in the scam accusation, it would be good. Many people will be willing to tag them for you.
So, just my fault? Atomic wallet's fault? 50/50 fault? Any possible recovery of sent btc? Should Atomic wallet refund me since it actualy accepts dogecoin address via btc sending?
Your fault was to hold so high amount in a shitful wallet. There are so many good wallets out there: Electrum, Ledger Live, Coinomi, etc which will not cause the loss of your funds. There is simple no reason to use atomic wallet, unless you want to get some forked coin which they support (but forked coins are not worth anything, so I doubt this is the case)
In my opinion, you should really invest in a ledger nano or a trezor hardware wallet. You can get it for ridicious low price, like 35-40 USD.