Is it worth the effort to earn $300?

I keep getting advertisements from Chase bank to open new accounts with them. (I’m happy with my current credit union and have no real reason to change).

The latest ad offers a $300 bonus if I open a savings account and let $15000 sit there for 90 days. Their savings interest rate is .01%. So after 90 days I would have earned a whopping 37 cents in interest.

BUT if you do the math, their $300 bonus for account opening means that the real interest rate I would be earning is 8.1%, which is a much different incentive.

Is it worth the effort to open an account and close if after 90 days to earn 8%?