Not that I use Facebook myself, but I think this was a misstep in the U block team.
All this did was tell the major companies out there that the only thing they have to do to make it so u block origins no longer works on their site is to make it extremely tedious for the team working on the project to make filters. So I expect that now that they've officially dropped support for Facebook, the other major sites are going to look at how Facebook is doing it, and they're going to adopt a similar systems