It does not take a rocket scientist to plug in alta vista bable fish to terra es sign up rules, where it very much states no porn and no commercial sites, just like tripod geocities and the like...
but it could be a reason for your sponsor ship program to cancel you
"Adult sites only. No non-adult freehosted sites like Tripod or Geocities." (rules,from a famous

adult program)
We have all seen posts; "xyz program are a..holes, they didn't pay me"
Is terra good for the adult industry?
It doesn't take much for a program to save the html and put it in a webmaster's reference file.
Are these webmasters who use them potentially being set up for a cancellation, if their ratios fall?
From terra's terms and conditions page;
....to abstain to use Service to obtain, to execute, to
spread, to
transmit or to put to disposition of third information, contents and services that, anyway, is illicit, that contravenes rights of property intellectual, of property industrial or of any other nature pertaining to third, that they incorporate violent or
pornographic materials, which they can induce to error on its object or the intentions or intentions of the comunicante, that incorporate physical or electronic virus or other elements that by its nature or its characteristics (such as format, extension, etc.)....