As a side note: Since yesterday's twitter backlash, a lot of people are requesting to delete their accounts only to get a response back with a dodgy document[1] stating "that they require time to understand your demand" and "that it will take from 1 to 3 months to process". The say that "they may ask additional identification". They ask for email/username (which they should already have??) and that depending on the frequency of your demands, they may charge you a "reasonable fee" for "administrative costs". The GDPR require the capability of deleting ones account from a platform be "without undue delay"[2]. I'm no lawyer but their response seems to violate the terms.
[0]Article in greek. Basically says that their income went from 43M euros to 64M and they paid a dividend of 20M euros to their shareholders: https://www.capital.gr/epixeiriseis/3551288/tinaxe-tin-mpank...
[1]Greek again: https://twitter.com/mpodil/status/1438620693055352834
[2]Paragraph 1 on grounds of (b) https://gdpr-info.eu/art-17-gdpr/