I had recently bought a new domain name, to migrate e-mail to and move away from GMail. When I changed my Discord account's e-mail address (which worked), I was booted out of Discord as soon as I clicked the confirmation link in the new inbox.
When I tried to login again, I was told that "something fishy is going on", and was prompted for my mobile phone number.
Unwilling to hand this over, or to deal with a company holding one of my accounts to ransom trying to extort yet more unnecessary information out of me, I asked them to delete my account. After all, I have no use for an account that I cannot use.
I had to ask three times in the ticket before they actually entertained the notion (I was one e-mail away from CCing the Information Commissioner's Office), and then had to reply in very specific employee-provided verbiage to the tune of that's what I actually wanted.
The ticket was updated to say that this would take up to 14 days. I then got an e-mail the following day saying that it would take up to 15 days.
This does not strike me as a company that gives a damn.