Effectively single-vendor. I'm not aware of any ACME-compatible CAs that don't have pernicious limits on their free plans (and if there are, I'd love to hear!), and here in the EU we've even recently lost a rather big player...
The other CAs aren't prohibitively priced for anyone who has a business need for lots of certificates, in case Let's Encrypt disappears or goes rogue.
Not if you look at the per-cert pricing, but if you factor in the cost of "dealing with incompetent sales" and "convincing accounting to keep the contract going", they absolutely are.
We pulled all of our business after they failed to renew a cert with 30d(!!!) notice and got themselves stuck in a loop of useless org re-validations.
They were completely unresponsive and wasted dozens of hours of our time trying to rectify the situation before we pulled the plug and switched everything to ACME. I still can’t believe we wasted so much time and money with them.
> If you have a server or other device that requires automatic issuance of certificates and supports the ACME protocol, you can use our free 90-day ACME certificates on all plans.
Zerossl is integrated with Caddy by default and there’s no indication from Caddy that you would only be able to renew the cert twice before needing to cough up some money.