I think it is. How about organ donations (I know the comparison is a bit of a stretch, but it is the same situation)? The experience in many countries is that m

I think it is. How about organ donations (I know the comparison is a bit of a stretch, but it is the same situation)? The experience in many countries is that many people say they would be donors, but don't actually get a card. If you make it opt-out, you add some friction to not donating, but people still have a say. I like the model in some US states most, where they ask you when you get a drivers license. You can answer yes or no, but you have to answer something. There is no lazy option. If there is something that gives you an aggregate benefit, but no immediate benefit, and you have to go out of your way to agree, and maybe there is some scary legalese that you have to sign, then most people will just not bother. I don't mean harmful things like sharing PII with advertizers, political parties, or law enforcement, but only things like censuses, public transportation statistics, application crash analytics.