Earlier quoted context omitted.
The only reason you can block ads on the web is because there was a small window where the idealistic academics that built the internet and the web were able to keep commercial interests out so they were able to use open universal protocols. The same will not be true for VR.
It’s already not true on mobile generally. No view source, no extensions, no user injected scripts. You get the page the server wants you to see.
Whatever it takes to maintain control.