> Did Apple ever offer a XMPP federated iMessage?
EDIT -> They did NOT, see below comment by nvrspyx.
Apparently they did, and removed it around Mojave-era or so...? I'm not familiar with Apple products, this statement is based on https://www.reddit.com/r/MacOS/comments/9l5xu7/mojave_now_th...
> Also iOS will always remind you Safari is there, as it is the default browser and that can't be changed.
> When did we have iTunes on windows Phone either?
I agree that incompatibility in general is not on its face evidence of anti-competitive behavior.
> Facebook offered XMPP messenger?
They did, then once they imported users to their platform, turned that feature off. That might have precipitated Google to turn off XMPP federation on GTalk to stop the bleeding.
> Shall Google ... not make changes they think are better(even if they are worse overall)?
Nobody said that Google cannot make any changes to their products. Moving from a standard 'everyone' can use to a closed-off system could be argued as anti-competitive, hence its inclusion on the list.
> Lots of developers didn't develop for Windows phone. Shall those be investigated too?
Those developers could refrain from developing themselves, but they were not in a position to stop competitors from developing their own apps. Google is in a different position.
> Yes yes, MSFT did make a youtube app, but google has full liberty to decide which platforms they want to make apps for
Google said not to develop the app that way, but this way. MS complied. Google still refused to allow the app for no explained/good/political/anti-competitive? reasons. Google was focused on killing Windows Phone, not the iPhone, even as far back as 2006. Eric S in the Verge article in my above comment "... at the time we were very concerned that Microsoft's mobile strategy would be successful."