oh GODS no. At most the license would change to CC-0 or CC-BY, but not more restrictive, not at all.
You’re free to go ham with these! And you’re absolutely allowed to make & share your own assets made with the bundle. I will add a link to this post in the 1st post, so that things are clear on this, but I genuinely have no plans of making this bundle into a paid resource, or put up any sort of gates. If anything, I’d love if someone found their own brushset through my work! 