Bonus points to load and inject all the HTML markup via ajax from a server you control, so even if they pay some kid to remove the opacity you can still time-bo

Bonus points to load and inject all the HTML markup via ajax from a server you control, so even if they pay some kid to remove the opacity you can still time-bomb the site underneath them. I did this once for a client that didn't pay (15 years ago when I was practically still a kid). It did not go well and I still did not get paid, but at least it was kind of fun.