In reply to Mark.

It's not about blaming, it's about what will happen in real life. Pure psychology - your brand name related to something bad, etc.

Probably many of their own clients were using this plugin and it doesn't matter that plugin was sold, what matters is that websites that were using that plugin were affected in a very negative way.

So plugin owner sold not only the plugin (a house), but also the phone book with contacts and the ability to enter houses of all the people on that book.

That's why when you read about acquisitions on WP Tavern, you notice how careful authors are when choosing the party that will inherit the product.