I think you can look at it another way, in terms of what can be achieved. Whether or not I think it's good that every pub I want to go to is shut, it's obvious

I think you can look at it another way, in terms of what can be achieved. Whether or not I think it's good that every pub I want to go to is shut, it's obvious that the government have the ability to compel them to do so. If the government want social distancing they have lots of tools to make it happen. They have far fewer tools to make a contact tracing app happen, when that app needs to be voluntarily installed by everyone. So doing things like turning it into a surveillance system (even if it's just because they want better Covid data) when other countries aren't, is just increasing the risk that the public turn it down and the whole thing fails. And "this app is bad and you shouldn't install it" can spread really, really fast. A few weeks ago my extended family wanted to do a video call and someone suggested everyone install House Party. The day we were going to do our first call some weird tweets went viral saying that app was hacking people's banking apps and other accounts. I'm not sure what came of that, the accusation makes no sense, but our use of House Party was cancelled because there was something on Facebook saying don't download it and how are non-technical people meant to distinguish it really when basically everything you can click through to on Facebook is a scam? If something like that happens then you really need credible people to be able to push the messaging that this app is vetted, people can trust it, it's safe. If all the background noise is about privacy and similar concerns, then negative messaging can get a lot of cut through with nothing pushing back. I'm pretty certain nobody in that family chat who saw those Facebook posts will ever install House Party, and I'm pretty sure a few well placed Facebook posts going viral with no credible voice telling them otherwise could stop them installing any contact tracing app as well.