Not that I don't believe you, but you mind linking some? the best I could find was wealthfront cash, which is isn't a savings account but is giving 4.05% apy. Which is pretty good, but inflation's up at like 6.5%, so it's still a bit of a net loss
Some banks do it as a short term loss leader to acquire new customers. Eg Primus bank recently offered 5% interest, then after a month or two their rate fell back down to treasury APRs
I typically check the top rates for savings, checking, and CDs each week. Deals can appear then disappear quickly. The best rates often have restrictions, but not always.
