I did note $20-300. In particular, domestic employers would surely still spend the upper end of it for each of their engineer staff. If there are 4 million software developers in the US of any job title, and if the employer of each spends $200 per month for the developer, that's $800M per month in revenue.

you wouldn't get the full market share, but for 1T company with 20pe you still need ~10B of revenue per month. And growing. that is hard from subscriptions alone because there are only so many developers. (google has 40B per month and is a 4T company.)