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I do believe that is the case. I'm not questioning the reason for the uninstall. And, just to be clear, I'm not questioning his motives either. I think it's a really useful program and SDK.

I just didn't like finding out it was a paid app after I innocently clicked on update and uninstalled. I trusted that I was actually getting an update. I was left without my notifications and a bad taste.

Sandboxing only applies to applications in the App Store -- regular downloaded applications from a website will not have to abide by the sandboxing rules.

Sandboxing is only required for apps sold in the Mac App Store and the OS won't require apps to be sandboxed. None of your non-sandboxed apps will stop working on March 1st.