FB is hitting the issue the "growth at any cost" business philosophy hits, they've run out of subscribers. Like any system or organism(s) they hit the resource wall, in this case people. There really aren't more people to sign up, they've pretty much squeezed what they can from advertisers. Now they are left with hairbrained schemes to push out into unrelated areas at the cost of accumulating debt. Buying up other businesses has a very mixed track record.
Wall St hates stable, steady, companies. They want endless growth when it ultimately isn't possible. Without expansion the only way to grow profits is to cut costs. Shareholders and boards demand more. You lay off people, you cut benefits, you make the service poorer quality, cram in more junk ads, more scammers and fraud due to a lack of human monitoring, no customer service for aggrieved users, profits go up for a moment from the cuts but people start to leave so you cut more. The MBAs take the reigns, disconnected from the founders and no loyalty to the business. Execs get their bonuses for each cut and layoff and flee the sinking ship. Hedge funds profit off of the falling stock as they short it. Ads become click bait, toe fungus and ear wax ads. Down it goes...
Oh it also owns WhatsApp, one of the best messaging platforms for scammers. FB's reels feature is mostly AI generated scammy crap. I've noticed a dramatic upsurge in blatantly fraudulent accounts on FB recently. I report them all but I doubt anything is done. I have never received any feedback.