90 percent of Twitter's $5 billion in revenue is from advertising,

[Cattledog]

More than a third of Twitter’s top 100 marketers have not advertised on the social media network in the past two weeks, a Washington Post analysis of marketing data found — an indication of the extent of skittishness among advertisers about billionaire Elon Musk’s control of the company.

Dozens of top Twitter advertisers, including 14 of the top 50, have stopped advertising in the few weeks since Musk’s chaotic acquisition of the social media company, according to The Post’s analysis of data from Pathmatics, which offers brand analysis on digital marketing trends.

https://www.washingtonpost.com/technology/2022/11/22/twitter-advertiser-exodus-musk/

[genxlib]

1. This might be leaping to conclusions

But I would assume the other 10% is from selling your data.

What other income stream did they have (before selling the blue checkmarks)

[Angleae]

3. Possibly licensing patents.

[Voltaire2]

2. Everyone getting off that site will end its advertising revenue.

Regardless of what the CEOs decide, if they can't get clicks they won't buy ads.

Boycott twitter.