Admin & sysadmin of a Warframe-focused Lemmy instance at https://dormi.zone.
Developer of a UI mod for Vivaldi Browser: https://github.com/HKayn/vivaldi-vh
Did you read the linked blog post?
Unfortunately, in most cases people share these sensitive items using methods that are inconvenient and not secure, such as text message or email. This makes it difficult to restrict access in the future, and whenever you update your password or other item details, you have to resend the information.
Proton plans explained: https://proton.me/support/proton-plans
Proton business plans explained: https://proton.me/support/proton-for-business
A Lifetime plan is functionally identical to a Visionary plan, just without any monthly cost.