bc.game is doing domain squatting or typosquatting.
I tried to access Stake.com mirror links like stake.games but mistyped it as Stake.game (without the "s") and was I redirected to bc.game. I think this is unethical because bc.game should not use similar domains (typosquatting) just to get some traffic. I remember Betsmixer.com get tagged negative trust rating because of typosquatting (when you type roobett.com you'll go to betsmixer.com).
As long as there is no malicious intent, there’s nothing wrong with registering a domain and redirecting it to a legitimate website that people might have intended on visiting when they mistakenly typed that domain. Most people probably aren’t aware that stake.games is a Stake mirror and would intentionally type that in their browser. It is likely more common that people who frequently visit both will occasionally conflate their names and type the stake.game url by accident.
What betsmixer was doing went above and beyond, because they were registering domains that weren’t even similar to theirs and what is even worse, they were trying to manipulate search engines into displaying their competitor’s name in search results that led to their website.