Facebook has always been first and foremost an advertising platform, and they went where the money is. Some of that's the automated algorithms, some of that is deliberate corporate informationeering.
I offer some thoughts on the decline and fall of the internet here, and I think it's germane to this discussion: https://michaelhjenkins.substack.com/p/visions-of-a-post-apocalyptic-internet?r=26iex9&utm_campaign=post&utm_medium=web&triedRedirect=true
I'm really glad that you're enjoying Linux, and I'm doubly glad that your hospital found a solution to keep their system running smoothly!