I think he means free as in open source, rather than free as in freeware. In which the worst case scenario is that you are stuck with the last open-source version, but at least you retain full control over your fork of the code and can add features and bug fixes as you see fit.
Then I'll find the fork and use that. We have already done that a few times. There is a reason we audit all the licenses of open source software we have.
Unless they suddenly turn from free into a $21/month per person fee.