开源买买买 ：APILayer构建的 SSL 商业，ZeroSSL、ACME.sh、sslforfree 和 CaddyServer

2019.8.1 APILayer收购zerossl  

当时他还实现了 CSR 生成和自签名证书

https://community.letsencrypt.org/t/zerossl-announcement/100277

2020.1.30 - APILayer 收购 acme.sh

https://x.com/neilpangxa/status/1222792801835872256

这个 apilayer 居然做了一个仓库，全是免费服务，https://github.com/public-apis/public-apis

2021.1.30 ACME.sh 修改默认供应商为 ZeroSSL

https://community.letsencrypt.org/t/the-acme-sh-will-change-default-ca-to-zerossl-on-august-1st-2021/144052/7

声明被删除在 2023 年左右

https://github.com/acmesh-official/acme.sh/wiki/Change-default-CA-to-ZeroSSL

2020.5.3 用户表示 sslforfree被收购

https://community.letsencrypt.org/t/sslforfree-com-is-ruined/123164

我找出来当时的邮件了

2020.10.20 ZeroSSL 收购 CaddyServer

https://github.com/caddyserver/caddy/commit/97caf368eea8d2c33a7786fbe3471b83b5b294dc