If only hashtags were case sensitive, and subscriptions could include some logic, I could subscribe to #meta posts that weren’t just about #Meta.
@misc It's issues like this that more or less demonstrate that actual groups/communities are generally a probably better way to go.

As a quick example, IIRC, lemmy/kbin have various communities in which Meta may come up (eg Fediverse, Technology), but also specific communities for Mastodon or particular platforms/apps/tools, including Meta/Threads. That collisions are not permitted, and the communities moderated, helps.