In theory one day its going to be too much for our current bandwidth. We are no where near that even with single user instances.

But there is ways of making things much more efficient. Piefed for example bundles up votes so the API doesn’t get hit with millions of upvotes all separately. Peertube has P2P video sharing so the more people host/view videos, it actually gets faster. Theres a ton of others. But it sounds like a future issue.