Revise the hosting credit policy

Rather than adjusting the policy whenever the number of major
donors changes, this allows for some flexability in the number
listed based on who the current donors are.

Also list corporate members, who are an important source of funding.

policies/hosting-credit.md

@@ -7,6 +7,10 @@ permalink: /policies/hosting/
 
 OWG has adopted the following policy for giving credit to supporters who donate hardware or hosting to OSMF. OWG will:
 
-1. Credit everyone on [https://hardware.openstreetmap.org/thanks](https://hardware.openstreetmap.org/thanks) and link to that page from [http://osm.org/about](http://osm.org/about)
-2. Credit the top 3 donors by equivalent £/yr value on the [front page](http://www.openstreetmap.org/) (currently, UCL, Bytemark and IC), as "Hosting supported by \<donor direct links>, and others \<link to hardware.osm.org/thanks>."
-3. Try to publicise new supporters who are donating hardware or hosting from time to time via blog posts, tweets and other publicity channels.
+1. Credit everyone on [https://hardware.openstreetmap.org/thanks](https://hardware.openstreetmap.org/thanks) and link to that page from [http://osm.org/about](http://osm.org/about) and the [front page](http://www.openstreetmap.org/) welcome message.
+2. On the [front page](http://www.openstreetmap.org/) welcome message and the [about](http://osm.org/about) page credit
+    - the top 1-4 donors as determined by the OWG, sorted by estimated replacement value of what they sponsor (currently Fastly);
+    - corporate members, linked to the OSMF corporate membership page; and
+    - other partners
+3. Link corporate members to the OSMF Wiki corporate member page and link partners to https://hardware.openstreetmap.org/thanks
+4. Try to publicise new supporters who are donating hardware or hosting from time to time via blog posts, tweets and other publicity channels.