Yes... I honestly wish using and subscribing to tags was a more of a thing, since those are cross-instance, and multiple communities with overlapping topics could just make use of overlapping tags. And they also have the advantage that you can add multiple tags to the same post, no need to repeat the post.

Right now you can visit https://kbin.social/tag/technology/threads and see all threads tagged as technology, cross instance and cross magazine, but you cant subscribe to that (but it should be possible to implement at some point though, Mastodon does it).