If a website offers the same music in different formats or with different quality settings, that’s almost definitely only one release.
How we want to improve the display of the file differences isn’t clear. Here’s some food for thought about file formats:
When seemingly the same music is released in different stores, it comes down to where we draw the line between different releases and that discussion is not in a guideline ready state yet even though strong preferences exist. At some point, MB may develop something like release variants or other digital release specific stuff. Real guidelines are easier to make when the model is clear(er).
I would nowadays probably create a new release if I wanted to add a relationship to a digital album from one store but the relationship doesn’t apply to the albums from other stores. Such relationships tend to be barcodes and sometimes catalog numbers. I probably wouldn’t separate a release only because it has different copyright holders on one store although in those cases the barcode is often different too.
About this thread’s case: I think only one digital release is appropriate, as has been done here.