https://spliit.app/ is a free and open source alternative (there is an official instance but it is also selfhostable).

LibreOffice is a fork of OpenOffice and most developers went to work on LibreOffice instead. You should consider switching to LibreOffice.

The situation started here: https://github.com/SimpleMobileTools/General-Discussion/issues/241

Most Fossify apps are on F-Droid. They used to be known under the name “Simple Mobile Tools” and presented with orange app icons. The original author sold their brand/their userbase to an adware company, but the project lives on in form of this community-driven fork.