If we took up the .com as a redirect then they'd register .net, then .org, then .biz, then . country codes, then . whatever those new domains are (xyz, fun, io, there's hundreds of them). What we can do is protect our IP which is the lemmygrad name and logo (which they edited a bit to use). Stealing a domain name like that is against copyright law and other laws that try to prevent exactly this from happening. I think that was actually the original meaning of astroturfing.