Currently the AmEx EveryDay & AmEx EverDay Preferred are not accepting new applications with all landing pages including referrals resulting in errors (looks like the Cash Magnet card is also resulting in errors).
I suspect these cards are either being discontinued entirely or are being refreshed and applications will go live again once the changes are announced. American Express said they would refresh 40 products this year and earlier this year the card designs on these cards were updated. If I had to guess it would be on these cards being refreshed.
Hat tip to /r/amex
Source: doctorofcredit.com