@semolina I still have my Yahoo account, just like you did I use it for everything. But I'm seriously thinking of finding a new one. Yahoo is losing my trust.
Same thing happened to me. I used one email for like 3 years and I gave it to everyone (important people too, like schools and stuff) and because of some Yahoo Answers question I posted that they misunderstood, they said I was posing as a minor and the terminated my account.