You may be looking for a non-profit hosting provider with a sustainable economic model, that has more chances of being up and running 20 years from now. Or you rather need a server that offers anonymous access via the Tor network? Here are some recommended options:
Quicksy is a user-focused offer for Android by the developer of the Conversations App that allows you to easily create a Jabber account based on your mobile phone number. Other Quicksy users in your phone's contact list will be recognized by the app. Learn more about it on their website. You can register from within the Quicksy app:
XMPP.social is one of several domains you can register for free with Hookipa.net. Their servers are located in Germany.
Disroot is a non-commercial project based in the Netherlands and founded in 2015. It is run by a group of volunteers and offers various online services. You can learn more about them on their website here.