Strike allows for ‘instant’ funding from a debit card, and they’re carrying some risk while they wait for the transaction to clear. My guess is that their low weekly limits relate to this model.

Besides the low weekly limits, my experience has been very positive. It’s easy to use, fees are minimal, allows for instant withdrawal to a cold wallet, and the support team has been helpful and responded quickly the few times I reached out (once to increase the deposit limits, which they did)