Could you please explain any fees and/or spreads that Bancor, related parties or unrelated parties take when I transact on Bancor?
Regarding fees, Relay owners receive the spread incurred during conversions but it is calculated into the price.
As for profit, Bancor is a non profit and we sustain ourselves through the initial TGE and by increasing the value of the Network.
As you may know, transaction fees go to miners on the Ethereum Network.