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Can you please take more care about this, especially in Show HN threads, where people are sharing their work and discussion is particularly vulnerable? It shouldn't be hard to make a comment about barriers to adoption that doesn't come across as a putdown.
(b) Presumably this is meant for iMessage group chats where everyone is already, for better or worse, in Apple’s walled garden. Nobody is going to buy an iPhone just so they can use a Doodle clone with a nicer UI.