Of course, your open market does still exist --
users can choose Android, which thrives on the
notion of 'user choice'.
That's one reason why I, as a consumer, chose Android in the first place.
When I decided to buy a smartphone, I wanted one that allowed me to block calls and SMS messages completely, without leaving traces in the calls/sms logs. I wanted this because somehow my number ended up on a lot of spam lists and a smartphone should be smart about these things, right? If my email address is protected by spam filters, it should be a no-brainer for my smartphone to do the same for calls and SMS.
Imagine my surprise when I found out that such apps are banned from the iTunes App Store and that the only way to get such functionality on iOS was for me to root it and install software through Cydia. And why should I as a consumer go through so many hoops to use such software, when the company (that receives my money in the process) is actively hostile to my use case, a use case which is in no way immoral or unjustified.
When it comes to Android, building an app that blocks calls and SMS messages is still hard, as the APIs you have to rely on are private and keep changing, so the results are unpredictable. But upon a search on Google Play, I did find one that works well, installed with a single click. And I didn't have to root my phone.
Now that's what openness gets you - user experience is important, but it's all for nothing if the apps allowed don't solve your real problems.