It was never free. I believe there was some arrangement between PG / VSTfont developer.
I chatted with support. It seems that it is coming back to BIAB (or at least the version that was in 2020 if you had that). I was told, and if I understood correctly it is probably will be resolved in the next build. So hold your wallets at least till next patch to see where things are going with that.

Also, logic tells me that if you did have 2020 BIAB, VSTsynhtfont is for you to keep, regardless of future releases. But not sure if you started 2021 as a new user.
I asked rep to clarify this on forum, so there is no confusion.