The favorites limitation on the free tier is 5 and has been so for almost two and a half years now, users that installed their extension client prior to those two and a half years were not affected by this limitation and were grandfathered in (a reinstall is considered a new client).

I work on this extension by myself on my free time. a lot of time and effort goes into this, occasionally long nights and days, and thousands of lines of code. the favorites/cats feature is one of the more complicated features in the extensions. i could just make features for myself without even spending the egregious amount of time to make it production worthy but here we are. i understand that this might be a point of conflict but without subscriptions the extension as a whole would not have existed by now (est. feb 2020)

Oh im sorry, i had no idea i work for you for free.

I work on this extension by myself on my free time. a lot of time and effort goes into this.
You can see the full benefits of being a subscriber here:
https://previews-app.com/subscribe

PS: Literally most of the features are free!