It doesn't have to be governments. 3rd parties can build these systems either by themselves or paid for by governments and several governments can use/buy the s

It doesn't have to be governments. 3rd parties can build these systems either by themselves or paid for by governments and several governments can use/buy the same system. Also, these (some of these) can hopefully be open source apps, too. Pretty important as there will be privacy concerns (rightfully) which can hurt in two ways. First: the concerns could be real and the data collection could be problematic. Second: whether or not the first is the case, this may prevent a lot of people installing it. If it's a mandatory update that sidesteps the second issue, but then it could hurt Google's and Apple's image. Also, could cause serious problems with the EU (think GDPR). Even if they really can't get any meaningful and sensitive data out of it, they would be running the risk of an investigation.