and Binance, but in the latter's case I doubt they will do such a thing, they are using the fees as a motivation to have people use their shitty coin.
In theory you're right. However, if a big enough number of people would keep tagging CZ on Twitter and ask for adding LN to Binance, I expect he will eventually go for it (but I don't know what fee will they set there).
I don't think repeatedly asking CZ to add LN will get him to add it. I think market forces will be what gets Binance to add LN support. Although as others have mentioned, Binance has incentives to get people to use the binance coin (or whatever it is called) blockchain.
Anyone with a Kraken account used this yet? What is the maximum limit on withdrawals? Does it process instantly, or is there still a delay? Do Kraken allow Lightning deposits as well?
Based on the screenshot in the OP, they also accept LN deposits. If they didn't, they would need to consistently be rebalancing their channels.
I would assume the timing would be similar to any other transaction being approved (needing to go through the various security checks before the transaction is sent out), and likely has limits according to Kraken's current capacity, similar to any exchange likely set limits for on-chain withdrawals.
Given that they will still need to open/close/balance their Lightning channels, they are still incurring on-chain fees. I wonder if they are willing to cover all those themselves from their trading or on-chain withdrawal fees, or if their Lightning fees will go back up in the future.
LN transactions are not free, although the costs associated with them are very small currently. If Kraken can process 1000 withdrawals for every LN channel they need to open, the transaction fee costs associated with those 1000 withdrawals are 0.1% of what they would be if each transaction was processed individually, possible less considering that from time to time coin needs to be sent to/from cold storage.
If Kraken is also accepting LN deposits (as would make sense), in theory, they should not need to frequently rebalance their channels, nor close/reopen channels, provided their current sizes are sufficiently large.