Bandwidth Azure virtual machine with nextcloud and Wasabi storage

Hello to the community.
I am planning to mount a wasabi bucket to an Azure virtual machine with Nextcloud, as wasabi doesn’t fee for PUT, LIST, etc operations, but there are high costs related to Azure bandwidth (internet egress and data transfers between regions, although no cost in the same region).
A drawing to easy understanding:

Are Wasabi East US region and Azure East US region the same? so traffic between them have no costs?

1.b and 2.a counts as internet egress, and all of them count as data transfer between different regions?

Is this a good solution? I appreciate any recommendation.
Does nextcloud offer onetime installation support? or thru partners?

Thanks in advanced.