It might be interesting to have a documented list of public SPARQL endpoints that serve wikidata and document them:

• might help to promote the work done on a triple store and gather feedback useful to its development (e.g. qlever, milleniumdb)
• might help some WDQS users hitting query timeouts
• might possibly cover usecases affected by the split and where federation is not possible

AC:

• search for all known publicly available endpoints
• contact their owner and get more information on the service
  • whether they're OK to be documented from a wikidata.org page and thus start receiving some traffic
  • expected update rate (how often are they planning to the dataset)
  • are they interested in getting feedback and if yes how
  • privacy policy (if they have one)
  • usage policy (is it ok to send 100 qps their way?)
  • link to bug tracker or other ways to report issues
• find a place to document this list