Yes, there are many field that are still struggling, but nowadays most of, if not all, the articles in my domain is published by ACM and Schloss Dagstuhl, both are academic governed non-profit that are full open access (I don’t think author even have the option to close access.

That being said, fields like medicine, biology, engineering is very much behind. I am very glad my field moved away from publishing with IEEE. They are not necessarily “behind” the entire academia, but certainly way behind my field.