The way ActivityPub federation works, once an instance is "linked" (like lemm.ee linking with lemmy.world, lemdro.id, etc), the instance will now send them an event once a post is made or something like that.
For example:
- lemm.ee ---links--> lemmy.world
- lemm.ee user makes a post A
- lemm.ee ---notifies--> lemmy.world
- lemmy.world makes a copy of post A.
So yes, every Lemmy instance stores copies of new data from other instances once they link.
You can access Photon at https://phtn.app/ to use any instance, or selfhost.
Additionally, some instances I'd recommend that use photon are
- lemdro.id (which uses it as their primary!)
- p.lemmy.world
- photon.slrpnk.net
I'm curious why your instance, sh.itjust.works, hosts Tesseract but not Photon. They have diverged so much they cannot be considered similar.
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I'll stick to FUTA.