This seems like a waste of time. It's not illegal to register a domain name, no matter how similar it is to your domain name. If you want those domain names, then buy them. My family runs a business and we bought the domain names that we thought were similar. We respect the fact that if someone buys our domain but with ".io" at the end instead, then that's their right. I would be very scared of a world where people can sue over names being "too similar to this large company with lots of money and power". These domain name companies serve one purpose: selling available domain names. It's not complicated. Let's not make it complicated.