After I have managed to restore it more than 4 hours later, I permanently deleted my account and Google immediately contacted me with apologies, asking me for the reason I did such thing.
They have tried to persuade me to restore my account with a couple of emails, but it was already too late.
I cannot trust them anymore.
I want to have absolutely nothing to do with Alphabet or Google; if a certain service that I currently use gets acquired by either of them, then I will delete that account too immediately.
Enough is enough!