It’s all about association. The people who like “rough and tumble” social media aren’t the audience most big companies want to capture with online advertising.
https://www.cbsnews.com/news/twitter-elon-musk-general-mills-audi-pause-ads/
To put an emphasis on the above:
https://twitter.com/sarafischer/status/1588585991371046912?s=46&t=NRR-25LjHUf1vvLF6gjZMw