The extension only collects a randomly generated user id, and your vote with a like\dislike. That is literally everything that is being sent - bare minimum for it to function. Nothing is being sold.

Unfortunately even a random ID for recording likes\dislikes is still "personal data".

If even the random user id is too much for you - there is an option to disable vote submission in settings. Then extension collects nothing (but your dislikes don't count anymore - so it's up to you)

The premium features are there to cover costs for everyone. Servers for this kind of load take some money.