I used a free domain coupon from domain.com a few years ago, and was spammed with both snail mail and robocalls (advertising services for the domain) for months afterwards. I don't know whether they're selling customer data or what, but it left me with a very negative image of their company.
> I don't know whether they're selling customer data or what, but it left me with a very negative image of their company.
Whois is public and has always been as required by ICANN. If you don't understand how things work then be fair and don't blame what you think is the obvious cause or reason. There are valid reasons for whois being public and all registrars have this in their agreement and it is widely known.