I’m really glad Mastodon 4.4.0 will allow server admins to opt into sending the Referer header, and I hope admins of large instances will turn it on.
https://github.com/mastodon/mastodon/releases/tag/v4.4.0-beta.1
I also hope that third-party mobile clients such as Mona, Ivory, Tusky, etc. have a way to query this via the API so they can also respect the setting.
Many people believe they get no traffic from Mastodon because their analytics service doesn’t recognise it. This could change, and give us a bit more clout.