I'm for anything that weeds out this "why not?" type of interop that just dials up the cognitive load for end users. The kind where the end user has to open a post in12 clients and then assemble a serial killer hunting pin-board with strings and polaroid photos to figure out what the original poster's intent might have been.

But I do think there is incentive.

In an embed context (my lexicon represents something non-core in your app) there are incentives both ways, you get your stuff embedded, I get that added info for my users, win win.

In a piggyback context (one app clearly just riffing of another) there's incentive to piggy back, and there's incentive to be piggy-backed off of, so also win win.

In most other contexts, probably no. So very context dependent.