About half of the users of JetBrains Software have a development environment on linux (beating MacOS). And about 60% of the projects that the developers code are being targeted for linux (presumably for Servers, but still a lot) Source: https://www.jetbrains.com/lp/devecosystem-2020/

Sure, but about 90% of their userbase is happy with the free community edition and will never upgrade. What is more interesting is the distribution of the remaining 10%.