

It will stop the lazy, which is 99% of the battle. If you want some form of security, then either a user generated pin or a captcha will do the trick to keep bots away. If you want to avoid both of those, then a longer url will also work. 12 characters will prevent attacks from getting anything but lucky.
800?
Eight. Fucking. Hundred?
Ban me. I don’t give a fuck. If someone abused anywhere near 800 children then they just need to die. We are infinitely better off without.