Why are most web services "spoofing" the From email header?

All examples below are "From" headers in emails sent from various web services to our corporate email. This makes it look like we are sending emails to ourselves.

Some examples:

    "'Amazon Web Services' via Redacted - Admin" 
    'Mezmo, Inc.' via Redacted Inc. - Admin 
    'service@intl.paypal.com' via Redacted - Admin 
    noreply-spamdigest via Redacted - Support 
    'Shopify Partners' via Redacted Inc. - Admin 

Some notable exceptions:

    Heroku Billing Team 
    Wise 

Questions:

1. What could be the justification for this practice?

2. Does this practice have a name?

3. Is this not considered spoofing?

4. Reading plainly, "X via Y" implies that Y is facilitating something on behalf of X, is this the intended reading?