Since we are all going; here is my take. Breasts were always sexual in nature. For most species they signal fertility and what part of the cycle the individual is in at the moment. At some point human females evolved to have perpetually inflated breasts. There are a few different theories as to why that happened, but it is beside the point for this discussion. So considering they were evolved to attract or dissuade males, I say they certainly have a sexual function. In addition to this, breasts play a big part in sexual pleasure for the wearer.
Now consider people pairing up in monogamous couples. The male suspects that other males might be motivated to pursue his mate by the visage of his mates nice boobies. He asks his mate to cover them up so he feels more safe in his position. Now hundreds of years pass, and what do you know, it is in grained in the cultures. It’s not really too bad for the women, so they have lived with it, for the sake of peace. Sometimes it is even convenient to be covered. For example in cold weather. I bet there is a correlation between climate and a cultures willingness to have boobs in the open.
Tribes have not only hidden their populations breasts, they have been known to hide their women all together, so the neighbouring tribes don’t steal them. I feel that this is a bit similar. Put a gold bar in a glass display long enough, and someone will try to take it. Everything carries risk. If your society isn’t good at maintaining law, then it’s a bad idea to display the gold bar. In some places it might not be an issue at all. All women could go around topless as well, but the risk that they are approached by an aspiring male will probably be slightly increased.
So why do it now, in my amazing, functioning, egalitarian and lawful country? It is down to history and people being comfortable with what we have always done.
My humble opinion is that we abolish any law that prevent any boob owner from showing them anywhere. But I’m lazy, so I won’t start a revolution over it.
Not sure I understand the reasoning for discontinuing. Google standing in the way? Not enough f-droid users benefiting from it? It didn’t see development cause it was already feature complete?