It is for-profit, but they have yet to turn a profit. Their financial situation is a disaster. 10s of millions of £ burned, with very little income. Look for yourself: https://find-and-update.company-information.service.gov.uk/c...
£31m loss in FY22.
Cybergibbons has also done a very good critique on how unsafe it is. See here: https://cybergibbons.com/security-2/why-what3words-is-not-su...
They are also very litigious towards people that call them out.