Forcing users to use a specific Authenticator app?

How disappointing it is every time I see a web site that’s intended for use by otherwise intelligent adults, yet they want to force users to use a specific authenticator app.    The latest one I’ve encountered is Authy on BigCommerce.    I guess we aren’t intelligent enough to scan the QR code or copy the source.

 

Oh, and they offer the ability to enable this forceful authentication in your own store!   How thoughtful.