Impact of unauthenticated media ban (MSC3916)

[sebix]

Matrix and Synapse are sunsetting the unauthenticated access to media files

https://matrix.org/docs/spec-guides/authed-media-servers/
https://matrix.org/blog/2024/06/26/sunsetting-unauthenticated-media/
element-hq/synapse#17950

What is the impact this will have on stickers and the Maunium sticker picker?

element-hq/synapse#17950 (comment)

that's the point, since this change all media is require auth, so custom stickers in maunium that is based off msc1951, don't load, well you can send them (maybe), but you won't see any preview of what sticker are you sending, and it is literally the only way to use custom stickers in element.

Would that mean, that all stickers that are hosted on Matrix-Servers will then no longer work? (all the ones in packs/)
Can we prevent that by self-hosting the stickers?
What changes are required in the Sticker Picker code itself, e.g. the API endpoints:

stickerpicker/web/src/index.js

Line 35 in 89d3aec

const makeThumbnailURL = mxc => `${HOMESERVER_URL}/_matrix/media/v3/thumbnail/${mxc.slice(6)}?height=128&width=128&method=scale`