Not sure I fully get you... In your example, isn't the problem that nobody cares about this data? So there is no motivation to build a client. Whereas if these were beloved notes or minisites or whatever that got wiped out by the latest acquisition (e.g. see https://bento.me/ shutting down), people would know exactly what those are, and there would be incentive for someone to compete for the userbase.

E.g. Blento (https://blento.app/) is atproto Bento that I only saw a couple of days ago. But the cool thing is that if it shuts down, not only someone else can set it up again (it's open source), but they're also gonna be able to render all of the users' existing content. I think that's a meaningful step forward for this use case.

Yes, there's gonna be tons of stuff on the network that's too niche, but then there's no harm in it either. Whereas wherever there is enough interest, someone can step in and provide the code for the data.