Poserpro's problem with Mehndi's texture set seems minor to me compared to this.

Not to me. Mehndi's texture set was a merchant resource. A lot of artists were left vulnerable, unlike Renda, which (so far, anyway) affects only a few merchants. That texture pack was for sale for years, and was a bestseller.

Perhaps worse, that texture set infringed on the copyright of a large company outside of Poserdom. DAZ will protect their products, but they've usually proved pretty understanding. They're part of the Poser community, and don't want to trash it. They ask for the infringing item to be RTEncoded, or that it be changed. So far as I know, they generally don't demand big bucks in damages. (I expect a similarly amicable settlement will be made here. This is not the end of Rosity. Though it's probably the end of Renda...)