Hi there and welcome to the Community, @Ital_Jidlo 
Ah, I totally understand your feelings!
Unfortunately, there is no way to block users by IP address, but a similar idea is already on the Wishlist. Feel free to upvote it here - Block certain customer from using the chat
The good news is that users can’t send files/images during the chat. So, worry not - these users won’t be able to spread viruses or hack using the chatbot.
Please let me know if this clarifies things or if you have any questions left 