Friendica (formerly Friendika, originally Mistpark) is an open, free, distributed social network. It forms one part of the Fediverse, an interconnected and decentralized network of independently operated servers.
Friendica, the software itself, it is trade-free. Matomo is is only used voluntarily by some instances. https://github.com/friendica/friendica/issues/9316
I just registered an account and it seems to me that friendica is trade-free. However the browser extensions Privacy Badger and uBlock Origin go a bit crazy, but that must be because of the content and the external links posted in the feed. I also found out with uBlock Origin, that friendica uses Matamo which is a powerful web analytics platform.