I've noticed the same as well, I've starting getting emails about our previously-shareable Paid Apps no longer allowing Family Sharing, and I can't find any way to enable it again. IAPs have an option for Family Sharing still, but it looks like it's gone for Paid Apps. Strangely a few of our oldest apps DO somehow still allow Family Sharing... I don't see anything different under App Information or Pricing and Availability between an app that still allows it and apps that don't though -- there's no toggle to enable/disable regardless of whether it's still allowing it.

I received the same email, and just checked with my bank and I did receive this month's payment successfully this morning. Also haven't seen any alerts in App Store Connect (we only have apps, so not sure why this email and the previous British Columbia tax email came from iTunes Connect and the "Apple Music Team" all of a sudden).