This presents an interesting dynamic between upstream and distributors.
Assuming that sticking with Google made money for Mozilla from their deal, Canonical is essentially
removing a portion from the Mozilla stream to have their own stream instead.
It isn't like this dynamic is necessarily new though. On FLOSS Weekly, the author of Ardour
discusses the dynamic where an open source package through a distribution never gets the chance
to ask people for donations. With specialized software that is replacing closed source software that
would cost hundreds of dollars, the authors would like every user to be given at least a reminder of
the possibility to donate to the software they use. In this case, the distribution might not be
making money (although it could be attracting users and corporate clients and support contracts)
by making it easy to install, but the upstream authors are likely making much less from donations.