Lightning works well for spenders, not so much receivers who are stacking more than they spend.

Suppose I want to withdraw a fat stack of Bitcoin on LN from, say, Kraken. Either I'm withdrawing it to a custodial wallet, or I'm withdrawing it to a non-custodial wallet with enough inbound liquidity.

If I'm withdrawing to custodial, I'm only going to do that for small amounts. I'd much rather leave larger sums in cold storage or even on the exchange itself.

If I'm withdrawing to non-custodial, I need enough in-bound liquidity to receive the payment. Again, only really makes sense for smaller amounts. Larger amounts I'd probably be better off just receiving on-chain and opening up a new channel.

So what's the product-market fit here? Why would exchanges care? Personally I use LN exchange withdrawals for tipping randos on SN and Nostr, maybe purchasing the occasional BitRefill card and Mullvad subscription, but that's about it. And I'm balls deep in this ecosystem.