As mentioned by @Harvey, Solus no longer has any association with Unixstickers. When they changed their pricing and business model, moving from individual purchasable stickers to "packs", they cut out Solus (as in the stickers aren't part of the pack and thus we don't get any royalties) and never reached out to us.
Solus was so far as "based" in Ireland (as in Republic of Ireland) when the original project founder was part of the project. However, that was no longer the case when they departed, and basically Solus is simply "based on the planet Earth" in the sense that there isn't a centralized geographic location where we call ourselves home (we're not a business or organization, so we have no business tax home). @DataDrake (member of Core Team) lives in the United States and I live in Finland. I don't consider Solus being "based" out of either.
As mentioned by Harvey, the infrastructure is graciously provided by the Rochester Institute of Technology (RIT) , in Rochester NY, where Bryan (DataDrake) works. The rest of the infrastructure (e.g. services hosted by us) are there as well.