eBay promote service on View Item page
If you look at any item (unless I’m in a test group or the seller doesn’t tick any of the boxes) then just below the buy box a new strip has appeared which could have up to three messages in.
Whilst you as a seller may not be able to affect what’s shown, you can certainly tick some of the boxes and if looks like free post is a biggie. I’m not sure how experienced you have to be to get the “Experienced Seller” tag, possibly it’s sellers with the most feedback as it doesn’t appear to be restricted to sellers offering eBay Premium Service.
Check your own listings and see if there are steps you can take to get more tags on your listings, “New” and “Free Postage” are the most likely, but also having “100% feedback” instead of 99.9% just became more valuable than it ever has in the past.