In the world of Site Reliability Engineering, it’s better to fail than to be inconsistent.

So I suggest the opposite here. Start out by realizing the site 75% of the time. Then down to 20%, then 100%. Randomly make it not work with no predictably.

The great thing is if he uses his phone on a cellular network, he can’t be sure whether it’s because the site is working or because something hinky is going on in his network.