So, I just checked https://news.microsoft.com/leadership/. The vast majority of the people there joined Microsoft in the 80s or 90s. Two or three in the early 2000, and one after 2010. For one person it was unclear when they joined.
So, an overwhelming majority of the senior management were perfectly happy to work for the "MS of the 90s". Therefore, it's hard to see that they'd be particularly uncomfortable with the ethics of the "MS of the 90s".
Companies definitely have personalities and traits that last longer than their constituent members, that's what's called a culture. Just like a nation has defining features that will still be around when every single currently living member is dead, so have companies. In particular old, large ones.
That's not to say that they can't change, and Microsoft definitely has changed since the 90s, but the past is not irrelevant.
I see it as reminder to frequently check whether my opinions on different things are still valid.
The MS of today isn’t the MS of the 90s. That’s not to say they’re virtuous and wonderful today, just that banging on about the past doesn’t really feel relevant.