Sarah Gooding did a nice job summarizing the changes Jetpack is testing for paid block upgrades. It is controversial in the community as it fits within the gray zone of what should or should not be allowed. I appreciated Jeremy Herve's comments to the post.
I think it's fair to say I support good user experiences for paid upgrades in WordPress. I also support a level playing field where Jetpack or anyone else does not have special privileges on where and how to promote paid products. I think that's obvious, but it can be easy to add drama to the situation. I trust the plugin team will help Jetpack fulfill both criteria, like they would for any other large player in the field.