Qualify definition of free in spaces/instance hosting (more work required)

Author: PhilReedData

TeSS_docs/spaces/instance-or-space.md

@@ -8,7 +8,7 @@ TeSS is an open source, reusable software platform, and has been [deployed by se
 - {fas}`clipboard-check;sd-text-success` Appears as its own distinct catalogue
 - {fas}`clipboard-check;sd-text-success` Can exchange materials with other TeSS instances and spaces
 - {fas}`clipboard-check;sd-text-success` Support from the global TeSS community
-- {fas}`clipboard-check;sd-text-success` Free to run and use
+- {fas}`clipboard-check;sd-text-success` Free[^freespace] to run and use
 - {fas}`clipboard-check;sd-text-success` No installation or server required
 - {fas}`clipboard-question;sd-text-warning`  Limited technical customisation options  
 
@@ -18,6 +18,9 @@ TeSS is an open source, reusable software platform, and has been [deployed by se
 - {fas}`clipboard-check;sd-text-success` Appears as its own distinct catalogue
 - {fas}`clipboard-check;sd-text-success` Can exchange materials with other TeSS instances and spaces
 - {fas}`clipboard-check;sd-text-success` Support from the global TeSS community
-- {fas}`clipboard-check;sd-text-success` Free, open source software
+- {fas}`clipboard-check;sd-text-success` Free[^freeinstance], open source software
 - {fas}`clipboard-check;sd-text-success` Can be fully customised by your own development team
 - {fas}`clipboard-question;sd-text-warning` Requires installation and server administration (at your expense)
+
+[^freespace]: The TeSSHub does not charge for space creation but is dependent on overall funding. Other multi-space TeSS instances may vary. 
+[^freeinstance]: The TeSS Platform software is freely licensed but you must cover server and administration costs.