Journals integrated with Publons enjoy extended engagement with their reviewers - for no extra work.
Publons sends post-publication reviewer engagement emails to alert reviewers to the publication of the manuscript that they reviewed (and got recognition for on Publons).
It is sent to reviewers after a manuscript is published and is great for two reasons:
It extends reviewer engagement beyond the review itself and into publication
That engagement happens in ways that tends to boost activity around the article (the email links to the article of record, shows Altmetric data, etc)