This is a big problem for our non-profit organization. All of our documentation is stored in Confluence. We are fortunate enough to use a free Community license for self hosted servers, but this announcement would remove the free Community license and would force us into a Community Cloud license that would cost us over $4k a year. Are there any good, possibly open source, alternatives available for non-profits?
Depending on what you have, you might look at Xwiki (xwiki.com) or Bookstack (www.bookstackapp.com). I find Xwiki's look-and-feel not as nice as Confluence's, but they have many of the same features and they have a migration guide for importing data from Confluence.