> create lock in like how they did with iMessage instead of cooperating with oth...

    > create lock in like how they did with iMessage instead of cooperating with other platforms on a common standard

I'm confused by this complaint. Do you say the same for other popular (and closed ecosystem) messaging apps, such as WhatsApp (big in US/EU), Line (big in Japan), WeChat (big in China), and Kakao (big in Korea)? What is the financial incentive for any of these platforms, including Apple's iMessage, to open their ecosystem?