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It makes sense that there are fewer "new questions" about an older technology. They've already been asked, you just need to look them up.
Flutter for web exists, but all those answers are lumped in.
That said, it may also be a quality indicator: maybe RN users just have fewer problems. Maybe RN community members are better at documenting problems and their solutions outside of StackOverflow?
Flutter is where RN was three/four years ago, it's far too early to even think about calling it the king of cross platform.
- Learning a framework is still usage of the framework and so even beginner questions lag "usage" statistics
- Learning a framework is prior to "[Production] usage" of the framework and so beginner questions lead "[Production] usage" statistics and job descriptions
I think I lean a lot more towards the first take, especially in our industry: in general we aren't paid to learn new technology stacks, our companies don't budget for such training costs, and generally don't like it done on company time. Sure we make a big thing about "we are an industry for passion" and often force software developers to moonlight and learn things on their own time/dime "as a hobby", but I wouldn't like to think there are enough moonlighters and "hobbyists" to make something "popular" on Stack Overflow with just beginner questions.
When my team struggles with a new library or stack, we go to the maintainers' Discord. Most of them seem to really want people to engage there.