The time for gnusocial.de seems to have come, so I decided to stop the service and shut down the server in the medium term.
The deadline is May 31, 2018, then it's over.
At the moment the server costs 24€/month and is at its limits in terms of load, which regularly leads to downtime. Debugging the whole thing and finally fixing the bugs is beyond my capabilities. The time required to compensate for such losses is also immense.
In addition, there is hardly any de facto development work on GNU Social. A look at https://git.gnu.io/gnu/gnu-social shows how little happens and over 180 open issues also says a lot. This shouldn't be a reproach to the developers, they just missed to get more contributors interested in GNU Social over the years. You're going to get even.
Another point is the necessity: when I started gnusocial.de, there were very few nodes. This has just changed through Mastodon, but also thanks to Friendica and Hubzilla. The Fediverse is a hundred times larger than just a few years ago.
And finally the “centralization”: gnusocial.de has 1,909 users today. Of course, this is far too much for a decentralized network. Find a node at https://instances.social for example, I may do the same.
Finally, I would like to thank all users, helpers, donors and friends. It was a great time and I always enjoyed doing the work for you. Until now - and that's why it's over now.