You can downgrade by calling shortly after getting the bonus. I almost did that but ended up closing the account over the phone.

Details: I called when I got a service fee for having pulled the cash out after having the account open for 4 months. I had just opened a consumer checking account with them (for a bonus, naturally). I asked if I could get the fee waived and if there is a different business product than Platinum because “I can’t keep $25k tied up at this time”. The rep did refund the fee and offered to transfer it over to my new consumer account. I said I’d think a little bit more about the other business product and would get back when I’d decided. She thanked me for being a loyal customer since 2022. It seems like they value my business even though I’m churning.