At the risk of going against the gestalt, Facebook openly and publicly rejecting the ads is actually one of the better outcomes. They could have just put their thumbs on the scale, deprioritizing them, serving them to people they think are least likely to bite, etc. Lying about the number of times it was served because, after all, who can check? Many of us suspect the ad platforms already do this pretty routinely through one mechanism or another anyhow, after all.

It isn't reasonable to ask a platform to host content that is literally about suing them, not because of "freedom" concerns or whether or not Facebook is being hypocritical, but more because in the end there isn't a "fair" way for them to host that. The constraints people want to put on how Facebook would handle that ends up solving down to the null set by the time we account for them all. Open, public rejection is actually a fairly reasonable response and means the lawyers at least know what is up and can respond to a clear stimulus.