Nothing breaks when you switch. You just can't create more private icloud addresses. I recently switched back to Android and can still use my old icloud logins.

Thanks, undocumented? Meanwhile reddit’s answer:

> In what universe if you stop paying for a service you can still access the resources of that service? Basic common knowledge.

But on MacRumors:

  “Update: So I let my iCloud+ account expire.

  When this happens you lose access to managing ALL your Hide My Email emails. Yet you can't even see what the Hide My Email addresses are any longer.

  But, people can still send emails to those emails. However, you apparently cannot reply to the emails with the Hide My Email address.

  This is troubling...”

But what happen if you stop paying $1 / month?