<prompt> Human: So I was reading this popular post about emergency funds today, and came across this little thread Insight and Netspend are subprime prepaid debit cards. If you use them for their intended purpose they will charge you a ton of fees like 1-2 each time you make a purchase with the card. However, if you use these cards as just a savings account you can earn 5 interest and not pay any fees if youre careful.So that begs the question, why is everyone using AllyCapital Onewhoever and getting 1.6 when we can be getting 5?Im currently considering switching over, but before I do, I figure Id check with all the smart people on this subreddit. Im assuming this isnt an oversight, and there are reasons I must be missing. The ones Ive considered so far but I think are mitigated are:1. Is it hard to get your money? I do agree that getting money in and out looks more difficult than, say, Ally. But isnt the whole goal of an emergency fund to never touch the money? And if you do need to use that money in a hurry, they do have quick ways to get it out that will only cost a few dollars.2. Is it safe? Its definitely less of a reliable brand name, but they are FDIC insured, so it seems pretty safe to me3. Will they try and get your with fees? They do charge you to use your card, but again, this is money I dont plan to touch. There are also other stupid fees, like for calling tech support and leaving your account inactive, but there seems to be good advice for avoiding thoseSo back to my question. Is there a reason I shouldnt switch to a card like this from Ally?Assistant: You touched on the drawbacks already, namely fees and illiquidity. Another big drawback is that these accounts have very low caps. Youre only getting 5 on a few thousand dollars, at most.Its probably a better use of your time to churn credit card rewards, especially since CC rewards are not taxable whereas that 5 interest is.Human: CC rewards are not taxableThis is exciting news to me, but Im surprised. What kind of income are they classified as? As far as I knew, all income was taxable in some way the few obvious exceptions like tax advantaged accounts, reimbursements, etc. excluded  <response>: They are generally considered a refunddiscount on your purchase, not income. 