You paid $150 for software which still works, which had no promise of updates forever anyway, and you're upset?
Not that your point is invalid talking about Grove - suddenly everyone who used it has to move in under a month. But I don't get the upset over Sparrow. If it helped you at the time, it should help you now.
I don't want to rehash Sparrow. But, if they'd had fixed long standing bugs, and added the features they promised I would not be so upset about it. But they didn't. They dropped the project and went on to Google.
Leaving with with a ridiculous "feel-good" blog post.
My point though, this isn't uncommon. And this kind of user treatment is one of the big reasons many tech start-ups have a tough time making the sale.
Now of course, if said company manages to get momentum (like a Dropbox, Github, FB - to name a few) - I guess they are no longer startups.
Not that your point is invalid talking about Grove - suddenly everyone who used it has to move in under a month. But I don't get the upset over Sparrow. If it helped you at the time, it should help you now.