As the i2p people say, anynomity is no boolean. Freenet allows you to take it a good deal further than i2p or tor, though. If you do it right.
Worst case: If all of Apple would want to find you, because you declared that you would post the videos of the new iDing - and already sent them your videos as teaser before starting to upload them from an Apple computer (and that just after they lost their beloved dictator), you might be in problems if you use Opennet. You are about as safe as with tor or i2p.
Best case: If a local politician would want to find you, after you uploaded proof that he takes bribes, and you uploaded the files to a new safe key (SSK) and used Freenet in Darknet-mode with connections only to friends who would rather die than let someone take over their computer, there’s no way in hell, you’d get found due to Freenet (the file data could betray you, or they could find you by other means, but Freenet won’t be your weak spot).
Naturally real life is somewhere in-between.
Things which improve anonymity a lot in the best case:
Important questions to ask:
See the Security Summary (mostly possible attacks) in the freenet wiki for details.
The European Copyright directive threatens online communication in Europe.
But thanks to massive shared action earlier this year, the European parliament can still prevent the problems. For each of the articles there are proposals which fix them. The parliamentarians (MEPs) just have to vote for them. And since they are under massive pressure from large media companies, that went as far as defaming those who took action as fake people, the MEPs need to hear your voice to know that your are real.
If you care about the future of the Internet in the EU, please Call your MEPs.