4. Some failed to complete it, because they had different data in their profile and their IDs. (they also couldn't change their data in profile - fields are read-only).
It appears that the majority of the issues stem from people using either fake, altered or erroneous identities when registering.
This is in breach of their terms and conditions which specifically state (these are their old terms and conditions from when people signed up).
https://web.archive.org/web/20170714045125/http://www.tradesatoshi.com/Home/Terms (2016-2017 terms)
Quote
Use of the Platform As a condition of your use of the Platform, you represent and warrant to, and covenant with TradeSatoshi that: (a) you have reached the age of majority in your jurisdiction of residence; (b) you possess the legal authority to create a binding legal obligation; (c) you shall use the Platform in accordance with these Terms of Use and all applicable laws; and (d) all information supplied by you on the Platform is true, accurate, current and complete.
While is sympathize with people in this predicament it is a common thing people tend to do when they try to use a website using a false identity. (Give partially inaccurate or completely inaccurate identity).
I would recommend spending some $ and finding out the registered address of the exchange and sending a letter explaining the situation and providing written proof of identity. (Or if there are a lot of funds - change you name by deed poll if you gave a fake one)
It is possible that they checked the identity on a database and found no match. A lot of exchanges are forced by law to start KYC. Even some of the decentralized exchanges are on the radar of law enforcement.
https://www.eff.org/deeplinks/2019/02/secs-action-against-decentralized-exchange-raises-constitutional-questions
https://bravenewcoin.com/insights/sec-enforcement-threat-driving-kyc-aml-implementation-at-decentralized
I haven't personally used Tradesatoshi for more than a year so I can't comment on whether much has changed.