I don't think Big Tech would want to buy Twitter (and neither would the Saudis; the Saudis want a finger in the pie with social media for political gain, but can't actually run it since that'd piss off the US government, with whom they have a shaky relationship.)
Big Tech wants grassroots businesses that they can sell to their investors as being The Next Big Thing, competitors that are small enough to buy without upsetting antitrust agencies or corporations that are filled with so much talent that they can sunset the product. Twitter has none of those; they're an established business (not grassroots), are a sizable competitor in their sphere still (look at your average social media share modal) and there's no talent left at Twitter (Musk fired half of it, the other half wasn't down for Musks insane work ethic. The only people left working at Twitter are foreigners who can't easily leave Twitter for another company, since the US deports them back to their home country when they resign if they don't have another job lined up; yes that's dystopian and ironic, considering Musk was an illegal in the US back in 2000 for a year.)