It is not publicly traded, value estimates are more like political statements now. To the owner, getting running cost down may have made twitter long term viable.
Ads are still visible when you aren’t logged on, in fact they take a fare greater real estate of the screen now so Elon’s antics aside as far as advertisers go they get a better deal now.
Before the change you could scroll down past the ads for the rest of the thread, now you only see the linked tweet and then ads.
