What you got is an altcoin address, and the reason why could be because you clicked on BTC deposit on Bitget, and instead of selecting the Bitcoin network or Segwit address, you went ahead to select either Binance chain or Eth chain, which addresses are meant to receive only pegged BTC on any of those networks.
 
I doubt any campaign will want to pay with that because that's not real bitcoin. 
 
If you need a BTC address, you can go back to the exchange and request another bitcoin address, which either starts with 1 or BC.