It's impossible to know now that Twitter is private and does not have to disclose quarterly results publicly.
- Are there high-quality brand ads running? (Fewer.)
- is there more hate speech? (Yes.)
- Is it plausible that check-mark and "coin" revenue can replace ad income (No.)
There has definitely been a rise in hate speech on twitter since mush took over.
https://www.forbes.com/sites/shaunharper/2022/10/31/elon-mus...