BY-SA is officially listed as one way compatible with the GPL (basically you can distribute a BY-SA asset under the GPL), with the detailed analysis shown here. Kbin is under the AGPL which to my knowledge is not listed as compatible, but it should be fine as AGPL is basically GPL with the condition that the source must be released if the modified program is run on a server and not directly distributed. Keep in mind that BY-SA does allow commercial use and basically is the art equivalent of software's GPL.

IMO the cleanest way to do this would be to distribute Kibby under AGPL directly to Codeberg or grant rights under a custom agreement if Ernest wants this to be the official mascot. Alternatively the Kibby asset could be released under a second license and people hosting their own Kbin instances would have to comply with the second license to use the mascot. This could work as Kibby isn't required for Kbin to function instance owner could easily substitute a different image if they don't agree with the license.

How would you compare it to Matrix? I use Matrix and have never tried XMPP.

I've never used a colo before; my rack servers live happily in my basement. If you google say "1U network colo <city name>" you'll find many providers.

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