Let's Encrypt has de facto monopoly. I think we could have added HTTPS if we had dozens of projects like Let's Encrypt otherwise this is just handing over too much control to one organisation.
Is that even remotely true?
There are alternatives to Lets Encrypt - AWS has an equivalent project where they issue free SSL certs for AWS resources.
It is possible to host LetsEncrypt alternatives, though. The viability is another matter, though.