Comment by prash_ant

They may be bought by someone bigger and then shutdown to protect the existing wild gardens. There are many analogies. Astrid[0][1] and Wunderlist[2] come to my mind.

[0] https://en.wikipedia.org/wiki/Astrid_(application)

[1] https://github.com/tasks/tasks

[2] https://en.wikipedia.org/wiki/Wunderlist