So you’re suggesting him to:
Drop out of his job (which you may not know).
Stop earning an amount of money that, may or may not be utterly necessary to keep his lifestyle (which you may not know).
Spend months or years learning a new technology, meanwhile unemployed or with a job that may or may not sustain his previous expenses (expenses which you may not know).
Re-make every single project that he owns to a new platform while adapting every single thing to a new environment, meanwhile solving a waterfall of bugs and refactoring problems, ultimately consuming hundreds of hours (bugs which you may not know).
After living miserably for a while, hunt for companies that somehow are using an open source tool that, most of the time, won’t tick all the boxes a company needs from a tool (companies and boxes which you don’t know).
Miraculously find such company and, miraculously rise to a position high enough that you can make a decision which changes the whole core of the development team, impacts licensing for other tools, new hires, compatibilities, and god knows what more down the line (changes which you may not know).
You’re suggesting that he goes down years of an even more uncertain path… just because you feel like It? To me It sounds like an Evil person’s plan. How can you be so assertive saying something which you may not know about? Jesus
the problem isn’t switching, the problem is making all the other people using It to switch too, not everyone cares about security or ads