Besides the open source issues, this tactic seems to reveal a massive desperation by the Kite folks. There is no way they couldn't have seen how negative this was going to look once people found out. Their ability to attract new users through word-of-mouth and organic advertising must have plateaued. Sneaking their service into a well-used plugin would have given them a boost in users, maybe enough to attract a new round of funding, but they must have known it would cause this kind of bad blood. Especially based on their past reception on HN, which was highly upvoted but in which they never convincingly answered the concerns about uploading users' source code to the cloud:
https://news.ycombinator.com/item?id=11497111
https://news.ycombinator.com/item?id=13977982
https://www.reddit.com/r/programming/comments/4erqgq/kite_pr...