Are you saying that the CDC should be the only source for US data?
What do you suggest for the other 194 countries in the world? The equivalent government arms in each country?
Apple is not blocking web sites. Apps for corona virus are likely a wrapper of a mobile web site, so if the app is blocked you can still see the site and read the same information, and you can even add it to your springboard and treat it like an app if you like.
Some apps may be useful, but others may be scam. Apple cannot have a full control on each one of them, that's why I think the safe decision is to reject any app that doesn't come from a government. As I said, you can still browse the site if you want to