Yahoo are the mindless spamming shimmering scum of the earth. They were the first to have a widely accessibly internet directory, but I have very little regard for their organisation: they've twice that I know of, (Konfabulator) been careless with takeovers and either allowed contact lists to be compromised, or willfully used/sold it to spammers.............. Grrrrr AND their services are/were not proxy friendly for extended periods of time....
As for MSN, they made an enemy of me when they closed down my hotmail account with logs and records of my world travels, shortly after they bought out hotmail. Also, MSN live "safe" search supposedly is family safe. But try something nasty on it, and keep a bucket handy.
Now, who should you really blame? The companies that have been bought out, or the buyers? Who cares. Neither MSN nor Yahoo are up to their game, lost in a desperate fumble for market share. Do they carry your best interests at heart?
Only one way to answer that question...... what to their founders, directors, CEO's and managers joke about to their closest friends and relatives... What kind of people are they? What drives them? What do they want? And if it truly is something benevolent, why are they so inefficient at accomplishing their goals?