Apple

Wait, you want to prevent you from visiting websites? And you want it to be a permanent solution?

1. Practice self control
2. Have someone else set up parental controls and block them so you don’t know the password
3. If you have no self control you’re going to find a way around #2

These gambling apps are dangerous.

There’s never a permanent solution if you yourself are the owner and controller of the device.

If you activate “Screen Time” restrictions, you’d have to give the code to someone else and tell them to keep it secret from you.

Any limitation you implement you can remove. Any other solutions would be enterprise focused and require MDM and associated security tools and IT to manage them. Really your answer is self control is your only option.

Screen time/Restrictions/Content restrictions/web content