OP, after you verified your account and got your money out, ask them to delete your KYC data. I've read that especially if you're from europe (EU), they probably will have to adhere your request (due to GPDR (?)).
Not that i'd verify the account for 150$ in the first place, because really, Bittrex and Poloniex are untrustworthy in my book.
Is that even possible? Will they really delete my data? I live in the South East Asia.
I'm actually not so sure about that anymore. I do think they
should as per the new GPDR rules for people who live in Europe, but if this is actually the case is really hard to find out for some reason..
Although even if they honor your request, they probably still keep them a bit longer for regulatory purposes, or perhaps never delete them at all, or hand copies to authorities before actually deleting your data.
People do claim they have succesfully deleted their Coinbase account -
https://www.reddit.com/r/CryptoCurrency/comments/ai1s6o/is_it_possible_to_request_kyc_data_be_deleted/eeklve0/ (Albeit the process was described as "sketchy" at best, and a failure at worst.)
I also find this quite unexplainable, but that's slightly offtopic.
https://www.reddit.com/r/bitcoincashSV/comments/a9icd9/bittrexcom_may_be_illegally_selling_your_kyc/
Perhaps this would be a good thing to test out; which exchanges allow your KYC data to be "Deleted". I for one would be curious for the results.