Always good advice for anything. A variation of this is that you should also not answer the negative: that you definitely did not do something, if someone asks you that on a phone call. This is meant to spread harm to others.

I was speaking to a pharmacist yesterday. Apparently certain pharmacy insurance companies in the US have set up call centers that randomly call people and ask.

"We are from the fraud check department. Did you ask for receiving XYZ medication that your insurance paid $$$$$$ for?". The guy who does who's salary is an order of magnitude smaller, immediately panics and denies he ever asked for XYZ, even though they are obviously taking the medication. The purpose is of-course for pharmacy insurance companies to challenge/deny claims for on ALL XYZ orders the pharmacy made.

Of course checking insurance payouts is a hassle so most people reach for panic first and shortly thereafter denial.

That's just icky.