According to OpenAI it's something like 4.2% of the use. But this data is from before Codex added subscription support and I think only covers ChatGPT (back when most people were using ChatGPT for coding work, before agents got good).
The execs I've talked to, they are paying for it to answer capex questions, as a sounding board for decision making, and perhaps most importantly, crafting/modifying emails for tone/content. In the bay area particularly a lot of execs are foreign with english as their second language and LLMs can cut email generation time in half.
I'd believe that but I was commenting on who actually pays for it. My guess is that most individuals using AI in their personal lives are using some sort of free tier.
https://i.imgur.com/0XG2CKE.jpeg