They'll probably open source Unity someday. There's not much money in selling dev tools, just ask Borland, Sun, or Microsoft.
You won't find startup-y inflated delusions and useless-crap features there.
(disclaimer: I use their paid tools but I'm not associated the JetBrains in any way)
I think that's not the case for Microsoft -- GitHub, Azure, OpenAI, Visual Studio etc. The make lots of money selling Dev Tools.
They do give away VS Code and VS Community is free so I guess tgat must cut into profits...
Not hard to draw the line from there to 'keeping people on IIS and MSSQL'
Cadence, Synopsys, MATLAB, Mathematica, JetBrains, Windriver, and many others make a ton of money selling specialized dev tools. The key in that market seems to be specialization, though, so most devs don't see their work.