Bots creating lists

In my database table “yith_wcwl” I have thousands of wishlists (70k). Almost all of them are not not created by visitors, but by bots. Is there any solutions (for guests) to block the bots from creating wihlists?

Also this makes a huge performance drop on my page. With wishlist extension active, the loading time is about 10sec, without just 1sec.
Mainly because EVERY product on the shop page loads the content of the database table to check if its on a list. This query is done by EVERY item again and again.
Would be better to make this query once and use the result somehow.