Yes, they are fairly well-known. They have been partnering with Spamhaus: https://abuse.ch/blog/abuse-ch-appoints-spamhaus-as-a-licensee/ https://abuse.ch/blog/

Yes, they are fairly well-known. They have been partnering with Spamhaus: https://abuse.ch/blog/abuse-ch-appoints-spamhaus-as-a-licensee/ https://abuse.ch/blog/abuse-ch-appoints-spamhaus-as-a-licens...