Scientific publishers Springer and Nature have fused recently. The results are absurd & ridiculous new author disclaimer notes (another topic) and an interesting "content sharing" model. An example here

The above link gives you full free reading access to the paper. While you cannot download it, it's a major boon IMHO, even if not really Open Access. [Probably major data harvesting behind it too.] Here

you can enter the DOI of your paper (if published by Springer-Nature), and if you're lucky get such a sharing link. Currently the choice appears limited, possibly they'll extend this to earlier publications. So far I've found only 3 of my papers from this year there.

Sprinter-Nature write “There are no restrictions on the number of people you may share this link with, how many times they can view the linked article or where you can post the link online.” Wow, nice!