Binance Bridge doesn't make sense...

So, I tried Binance Bridge a couple of days ago, but I didn't check the box to "swap some BNB gas in this order".

Honestly, I though I could pay with ETH for gas because I bridged it to the Binance chain.

Anyway, now I can't do anything with the ETH on Bnance chain, not even bridge it back to ETH because I don't have any BNB.

So, now I wanted to bridge even more ETH to binance chain and this time check the box, but then you see this shit:

The minimum amount is 0.346147 ETH

Wth is this? This is a lot.

So, when I do the math:

Minimum ETH to bridge without swapping some BNB gas, it's 0.052 ETH (currently around 150 USD). That's fine.

But with the "swap some BNB gas" option, it's 0.346147 ETH, which is around 900 USD.

Why? How?

BNB price is currently around 400USD. When I check the box to swap 0.5 BNB (which is 200USD), how is the minimum they require suddenly 900 USD?

Where is the logic in this? How does this make sense?