Redirect to another website when I share my Network

Hi,

When I am with my friends, I often share my network for they can connect to my 4G.

But I have not an unlimited data. So, when they go on Youtube for exemple, I wish they are redirected to an another website.

I have thinked to modify the hosts file in /etc/hosts but it is not working.

How can I do that ?

Thanks 🙂