Easy answer - does it show copyrighted broadcasts of games for free? Then yes, it's illegal, and yes, you cannot talk about it here. All you have to do is google "(name of whatever site you're talking about) piracy" and check the results.
If those results include such stories as, "(name of official organisation) shuts down (name of your site)" then that's a really good indication it's illegal.
This isn't rocket science. People should know, or should do some simple checking. Failure to do so will result in consequences.