Are you the only user of your web-facing Gitea? If so, put it behind Wireguard VPN, and basically never worry about bandwidth and security again.
So much this. Wireguard is so easy to do and no, the whole world doesn't need access to my shit, just me and a couple of close friends.
This is the most assured best way to make sure your remain the only user of your stuff.
I highly encourage folks to put stuff out there! Put your stuff on the internet! Even if you don't need it even if you don't think you'll necessarily benefit: leave the door open to possibility!