If you look in your access logs, or /var/log/nginx/access.log and look for user agents in the log file that indicate things like chatgptbot, etc. Then add if ($http_user_agent ~* "useragent1|useragent2|... useragents") { return 403; } to the server block of your websites config file in /etc/nginx/sites-enabled/. You can also add a robots.txt that forbids scraping. Chatgpt generally checks and respects that... for now. This paired with some of the stuff above should work.