They had managed to get a verb into relatively common speech and their revenue has collapsed since the Musk take over I'd say it's pretty thoroughly destroyed.
It's a private company now so I don't know what their revenue looks like but they certainly don't seem to be low on cash given how much they've invested in AI. You may not use X but it's definitely not "destroyed" lol
Also X isn't funding Grok, it's a separate B corp with funding of it's own, it's just been tightly integrated into X, so it doesn't really say anything about the money situation at Twitter/X.
https://www.reuters.com/technology/x-report-first-annual-ad-...