Anybody can list a token on a DEX like JustSwap as long as they are able to provide liquidity. If you are the person who created the trading pair then you can set the price at whatever you want.
I'm not trading very often on Decentralized exchange but things will be easy if they opted to list their token but what kind of change of chain BFG token is, you can trade if your token is on Binance and Eth chain if ever they list BFG on DEX I hope it will be on Binance chain although there is an option on metamask to shift to Binance chain, we'll see this next week.