Of course, it is very safe to take surveys for money. You do not have anything to lose when you do online surveys because they are all free to join. However you must make sure not to reveal your financial or credit cards details to any survey website.
Also ensure that you use different email address. Do not use your primary email address in doing paid surveys because most of the websites may send you unwanted or spam messages. Or even sell you email to a third party.
To be more safe, try to research and the survey website before joining. You can do this by searching for their users complaints and feedback. And also look for its payment proofs to know there is any.
Finally, if you don’t want to stress yourself in research for legitimate paid survey sites you may visit here