I remember reading them back in the early 90s (Robin Hood: Prince of Thieves, Far and Away, Back to the Future). They don’t seem to be a thing anymore (or am I just not noticing them).
As an aside I remember liking them but I was a preteen at the time so maybe they were terrible and I just liked the movies.
Even as a teen/pre-teen I remember novelizations being of decidedly mixed quality unless they came from a well-known author. It’s worth reading the novel version of 2001: A Space Odyssey, for example.