Is this a bad practice to move all our duplicate description products to a subdomain with no index?
JOHN MEULLER (Webmaster Analyst from Google):
I think you can definitely do that. It’s not something where I’d say you need to move it to a separate subdomain if you want to set it as no index. For us, if it’s no index, it’s not indexed. So you could do that within your main domain as well. It’s not necessarily something you need to separate out into a different subdomain. Google says it will penalize mobile interstitials.