Afaik there's no such thing called deposit, you pay fee for channel creation which requires online transfer that is why there's a fee and since the wallet provider does things on your own they might have a small commission added along with the fee but it's not that big of a deal when you're someone who send and receive funds often then you can save a lot that you might have paid as fee right?

But ever since the fee is at the minimum for a while creating channel might not be a preference for an average user but it does come handy if there's unexpected surge.