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Let's Encrypt is 10 years old today !
(letsencrypt.org)
This is a most excellent place for technology news and articles.
I think if LetsEncrypt went away, so would ZeroSSL's free offer.
However, I do think not having limitations on the API is good; automation is good practice and I guess this is a concession to customers /users who have no automation in place (though this is a sad state by now). LE doesn't offer anything comparable AFAIK.