It seams that wosign has registered the domains letsencrypt.cn and 
letsencrypt.com.cn in 2014 after the public announce of Let's Encrypt :

whois letsencrypt.cn
Domain Name: letsencrypt.cn
ROID: 20141120s10001s72911711-cn
Domain Status: clientTransferProhibited
Registrant ID: k35-n2041486_00
Registrant: 深圳市沃通电子商务服务有限公司
Registrant Contact Email: d...@wosign.com
Sponsoring Registrar: 厦门三五互联科技股份有限公司
Name Server: ns3.dns-diy.com
Name Server: ns4.dns-diy.com
Registration Time: 2014-11-20 09:57:27
Expiration Time: 2017-11-20 09:57:27
DNSSEC: unsigned

whois letsencrypt.com.cn
Domain Name: letsencrypt.com.cn
ROID: 20141120s10011s84227837-cn
Domain Status: clientTransferProhibited
Registrant ID: k35-n2041486_00
Registrant: 深圳市沃通电子商务服务有限公司
Registrant Contact Email: d...@wosign.com
Sponsoring Registrar: 厦门三五互联科技股份有限公司
Name Server: ns3.dns-diy.com
Name Server: ns4.dns-diy.com
Registration Time: 2014-11-20 09:57:28
Expiration Time: 2017-11-20 09:57:28

Let's Encrypt was announced publicly on November 18, 2014 ( 
http://www.crn.com/news/cloud/300074840/lets-encrypt-a-free-and-automated-certificate-authority-comes-out-of-stealth-mode.htm
 ). That domain appear to be registered two days after.

Certificate authorities are about trust. I don't feel comfortable about a CA 
registering a domain matching the name of another CA. What is the position of 
Mozilla about that?
Maybe Let's Encrypt or wosign have more information about these domains?

https://community.letsencrypt.org/t/letsencrypt-cn-and-letsencrypt-com-cn-was-registered-by-wosign/23786

Other relevant thread: Comodo Legal Phishing attack against ISRG?
https://groups.google.com/d/msg/mozilla.dev.security.policy/n-8kcrSuhjg/WKj-PAI2BgAJ
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