Not surprised at all. There is a lot at stake in terms of money and usage but practically nothing technologically which is ground zero for this sort of thing. (E.g. if there was a lot at stake technologically there would be a fork or a competitive product —- practically though the reason why people make Wordpress blogs and Wordpess splogs and why they are always trying to hack your blog to make it a splog is because Google learned how to index Wordpress well back when it thought blogs mattered. Invent some new blogging software and it won’t do as well for SEO.)
Yeah, try Typepad if you want to see what it's like to be at the end of a VERY long tail!
IMO, companies profiting off of opensource projects as part of that company’s business model should contribute financially to sustain the opensource project.
Why should opensource maintainers be expected to act altruistically in this scenario? Parasitic behavior poisons goodwill in opensource communities, and prevents future innovation and effort.
then release your software with more restrictive terms?