If posted to a public forum like this one, non-commercial usage is obviously required. On the biggest (i.e., for-profit) social platforms, commercial use is also required (if I'm understanding those terms correctly, at least).
There is stuff publicly available online that has restrictions on commercial use. Because I'd rather see how open source AI generation goes, I'd prefer to have non-commercial efforts get that sweet data without giving it to the major tech companies.
I'd say both, personally. On the app Sync (for a different platform), I was able to swipe away the current context to return to the previous one, going one layer at a time back to the homepage.
So I'd say ideally (and this is likely too much work to adjust), clicking a post should layer it over the current context. Clicking a close button or swiping with touch or cursor removes that contextual overlay. Ctrl/cmd click still opens a new tab instead, as does middle click. This could be a configuration setting that needs enabled, but applies at mobile sizes. Keep all normal href data (some services implement that in a way that prevents middle click/etc. from opening the new context in a new tab/window).
Maybe too "appy" for a website, but it was quite a nice interface for a native Android app.
Thanks for hosting this instance, BTW