Microsoft DANE inbound and license requirement

[Sidsel Jensen via dane-users]

Hi fellow DANE enthusiasts,
 
So last week Microsoft released some DANE documentation:
 
https://learn.microsoft.com/en-us/purview/how-smtp-dane-works#how-can-exchange-online-customers-use-inbound-smtp-dane-with-dnssec-in-preview
 
However it looks like Microsoft has put an E5 license requirement over the use 
of it once it's outside of Public Preview. Does anyone here know why they've 
come up with this requirement, which has a significant extra cost compared to 
an E3 or even an E1?
 
It will for sure put a dampener on the adoption, which I find a bit nonsensical.
Is there anybody on this list, with some MS insights that might shed some light 
on this decision?
 
Kind Regards,
Sidsel Jensen
 
Architect of Deliverability and Abuse @ Open-Xchange