Maximum volume of AJAX requests allowed

Yes - it is debatable (if you are looking at only one item from TOS and not as a whole)

Because you can make your website use a microphone
and depending on the decibel level, your PHP script in the background generates 3D images as a background image for your web page and this is refreshed quite often

what I mentioned is web-based content

But that simply exceeds the possibilities of the free hosting service because it simply consumes too many resources and can be interpreted as abuse

you will probably see 508 errors in the console log first