Huh? It says right there on the page you linked: "A startup money market account with a competitive APY of 4.50%". Yes, that is on the marketing page for their business checking account, but it's not the checking account that has the 4.5% interest rate.

Higher on the page:

> Free checking for your first three years¹, 4.50% annual percentage yield (APY)² on savings

Which is different from money market funds and way higher than anything out there.