@LoudLemur Ah so, the ackee code snipped has to be injected somehow into the app. This is dependent on the app and the app may also have no provision/feature to inject tracker scripts.
For example, say Ghost, you have to use code injection feature to inject this tracker script - https://ghost.org/tutorials/use-code-injection-in-ghost/ .
I don't know of immich/peertube/grav had code injection... One has to investigate each project separately.
Thanks, I hope some words to this effect could be included in the relevant section of the Ackee documentation, along with the mention of some search-terms that might be helpful, for example: code-injection, ...