Grandparents have shared photos of their relatives, just usually through wallet photos in the past, email maybe later - so it probably feels like a small delta on that. Probably doesn’t help more of their lives are spent online than in person now.
I’d been printing off photos in various sizes (wallet to 8x10) and sending them along to my parents/grandparents - but it does take more effort to follow through. I do post photos of kids to a private account but maybe once or twice a year.