You can make profit from this scenario if you are fast enough to deposit>withdraw>buy>sell>withdraw>sell>repeat.
lol. I think a lot of people have the same idea. and I have also been thinking of making a profit from the price difference
but i think you can't currently quickly buy bitcoin across multiple exchanges at once
Unfortunately it doesn't come to how fast you are but how fast the services you use are.
Whales these times are not depositing when the differences start to appear.
They already have both
BTC and fiat in place, they sell the coins they have on exchange a and buy with the fiat from b.
Then they move the funds around to have both coins and fiat for the next wave.
If you're going to depend on wires and confirmation blocks by the time your funds reach the exchange the opportunity might be gone.