does this somehow mean that dev.to posts will start to be under a paywall?
No I wouldn't think so.
We are very against the idea of a Paywall for DEV. The express idea of a site like this is primarily to distribute content broadly to help us solve problems and teach each other as we learn.
Paywalls completely suck 99% of the time and are antithetical to this idea.
Here's an old blog post...
I could see us coming up with some kind of functionality that is monetized-only, but for us it wouldn't be straight up content. It's possible that some other Forems could be web-monetized only if it fits the purpose of the community, but again not DEV.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.