Let me rephrase. More websites would want to be archived than not. So that should be the default.
This is how defaults are meant to work. Unless the default is somehow harmful or dangerous, they should be the thing that the most people want, so as to reduce the amount of work involved in getting everyone to their preferred outcome. Having 1% of websites opt out is far less work for the websites than having 99% of websites opt in.
> AND if that's the case, IA can either reach out to the maintainer via the email address gotten from the public WHOIS data OR the maintainer can easily go to the IA website and opt in!
You do realize how many websites there are. Why would you want to dump a collective million man hours of work on all of them to opt in, or the even worse consequences when they forget and then don't get archived like they would've wanted?