Current quest rewards come from the named campaign card. Some cards show a fixed pool, such as partner tokens plus OBT. A prize pool is shared under that campaign's rules, so the headline amount is not your expected payout. More participants can mean a smaller share.
OBT already exists. The old O-Points program supported its initial distribution and six monthly rounds. Do not treat a current bridge transaction as automatic entry into another retroactive OBT airdrop unless Orbiter publishes a new rule that says so.