Are these messages a scam

Absolutely a scam.

Don't click on links in any of the messages, install any of the apps the messages recommend, or call any "technical support" or "billing dispute" phone numbers that you might see.

It could be Phishing too.

• Beware of --> Phishing & Other Suspicious Emails 
• Know how to --> Identify legitimate emails from the App Store or iTunes Store 
• Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams —> Use these tips to avoid scams and learn what to do if you think your Apple ID has been compromised.

Yes. All scams.

Yes, Yes, Yes. They are scams.

I wonder if there's a place in iOS 17 where you can tell Safari to block all Web site notifications – the way that you can tell it to block all Web site notifications on a Mac.