I don’t think I have come across communities that have highlighted the subscription button in any special way (beyond styling), but I surely will keep an eye open because I think this is an interesting idea. I personally am also not sure what can be done beyond making the button jump into the eye (I’d recommend a rather alarming color that is different from the rest of the page / main brand color). Maybe it would make sense to add a sidebar widget with a button that has similar functionality, or a pop up that is displayed after x amount of seconds on a topic page.
@DannyPancratz Sending new category / community activity to other channels is a bit tricky, I think it is because there is not much of a standard (e.g. Slack has good usage numbers, but beyond that I don’t see many other options). We do have an RSS feed and I know that some people make use of it, but it feels a bit outdated and probably is not that popular any more.
Do you have specific use cases / categories in mind? I know we want to help you next year to e.g. increase numbers of subscriptions to product update content, but there will be more improvements around notifications / subscriptions in 2022. Also because of this I am happy to get more understanding of the underlying goals / use cases that you have here.