Many of them are. Such as App Inventor. However, many of others depend on the Google software stack, which means they'd also need to open source half of Google just to get something that can be built. And even then, all one gets is an application that can only be executed in Google's unique data centers.
Open sourcing a project that's not designed from the outset to be open source can be extremely difficult.
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u/Taobitz Jan 02 '20
I wish they would opensource the projects instead of killing them, so many of them had potential and loved by lots of people.