Yes, Finnair cheated me out of 600 €.
They canceled my ticket and that was it. No reason given. (Actually, the reason was quite obvious: I had bought the ticket during covid. Later they realized they could still sell these tickets for 1200€, so they raised prices and canceled my existing ticket and my reservation)
They don't have an email address, on the phone they just told me the ticket would be canceled with no refund (they offered a voucher in which I wasn't interested), I sent them a registered letter to their physical address and didn't get an answer.
My insurance reimbursed 500€, so I didn't pursue the issue.