For what it's worth, it seems authors can disable that popup on their own substack. I did, and it doesn't seem to have reduced subscription sign-ups, but even i

For what it's worth, it seems authors can disable that popup on their own substack. I did, and it doesn't seem to have reduced subscription sign-ups, but even if it does, not annoying people is always a good principle. It defaults to 'on' though, and maybe not everyone has explored their settings. It took a while for me to find it.