I'm an open source developer who distributes my apps both on google play, and f-droid. I'd like to be part of this effort, and it would really help for google to see how many open-source developers...
An insufficiently large list of pledgers might be viewed as evidence that there isn’t much opposition to the program, when in fact the opposition is overwhelming. In think such a list would need to be assembled without being published at first, and then only once it achieves a certain threshold (both in number of developers, as well as the number of notable apps that would leave the store) would it be publicized.
Godspeed if they can pull this off