Earlier quoted context omitted.
That's why the "extend" phase is there in the embrace/extend/extinguish strategy - to make it an insurmountable pain to migrate elsewhere, after first having lured the users in with the "embrace" phase. Letting it play out is just what they need to move from phase 1 to phase 2.
But "extend" hasn't happened yet. There's no need to cry foul until it does, because until it does there's no evidence of anything nefarious going on. "Embrace" on its own is perfectly normal and acceptable behavior. Vendor lock-in is an important concern regardless of who owns the platform you're being locked into.
If we wait for it to happen by then it will be too late