I think that Let's Encrypt gets a lot of undeserved criticism for being the only major ACME-compatible CA. Yes, it's not so good to have monopolies on authenticity, but Let's Encrypt was founded by Mozilla, the EFF and the University of Michigan and was endorsed by the FSF.
That's a pretty good set of organisations when considering the general status of the internet, and a set that doesn't overlap with the major players in consumer technology (Apple, Microsoft and Google).