At least if you are using Byteballs wallet, you can send small deposits to exchanges and have a small amount stuck if transfers are messed up.
I also had small bytes stucked in coinexchange.io, my deposits didn't come to the exchange several weeks after sending, lol.
I see it a worst case if your deposited funds didn't reach in the trading site which you're sending with. Let's be more vigilant and always have a precautions before engaging yourselves with those non popular site, and I think that would be a huge problem if their support couldn't respond to you promptly. Good thing if they'll have a telegram direct support so that everything will be relayed properly and could be given remedial actions.