Again, they didn't "cause" Apple to issue an update alone. The same method for building Find Friends features was used by thousands of social apps, and Path was just a hot target for the media at the time. It was certainly a privacy concern, but obviously not malicious intent.
Thousands of apps were using the same method for their Find Friends features, and I don't recall any instance where any of those devs were deliberately malicious in their efforts to build better features, or with users' data after the fact. Path was just one of the most popular targets for it at the time.
Which is the core problem with your post. You can't prove malice or even rationalize why they would be malicious, yet you go ahead and post accusations of theft anyway. It's clear libel and defamation, and you deserve to get sued.
There are more responsible and tactful methods of resolving privacy concerns, if this even is one. You should take some journalistic ethics courses before vomiting your opinion out to the world and claiming it as fact.
Clearly this guy doesn't know the legal grounds for libel. You can't throw unfounded accusations of malicious intent around. He deserves to be sued for publishing this BS.