> Forbes estimated 1 million people are using Nitro as of 2020, and they made $130 million in revenue in 2020. If you assume that's all the $10/month Nitro (not the cheaper Nitro Classic), then 1 million users paying for Nitro would only account for a pretty small percentage of that. If the Nitro users estimate is accurate, not sure where the rest comes from.

1 million users * $10/month/user * 12 months/year = $120 million/year

That is close to the cited $130m annual revenue.