Even though I only used the email account they automatically set up for me for junk registrations (my main mail was already @home/attbi/comcast before they bought geocities, then gmail when that was created), I ended up making a second yahoo account with a name that wasn't lame (which I still used for junk registrations, and other random things, but moreso than the one automatically created). One day the password on that second email account suddenly changed. I used the same password on both the accounts for years with zero sign of infiltration. I still continue to use accounts tied to the one with the mysteriously changed password. I did everything I could to get that one back with no luck. Maybe I was compromised by some hacker? I do recall during my efforts being asked by yahoo support something along the lines of "is this your main account?". There was never anybody that I could talk to, only text support, and most of my attempts/ticket submissions went ignored. Maybe they think I'm a hacker.
In the end, nothing but bitter feelings toward Yahoo for me.