That's a bit of leap. For this particular issue, which seems to be of questionable tenacity (is there any example of legal precedent for a company successfully enforcing such a clause in this kind of situation), GPL would "solve" the problem, in the same way that MIT or BSD or whatever would solve it: by having a different license that didn't include the cited condition.

GPL also introduces the other fun elements, chief among them being the "viral" nature, and I'm sure we opinionated HN folks could debate for weeks on whether the GPL as a whole is "more practical for business use".

I'm not sure whether you understood what I was trying to say. For any particular package that had originally had an MIT or BSD license, Canonical's requirement to remove trademarks and rebuild would apply. However, since GPL forbids that sort of requirement for derived works, and it was Canonical that happily sprinkled their trademarks everywhere in the first place, Canonical cannot make that requirement with respect to GPL packages.