  Since its proposal in 2013, geo-indistinguishability has been consolidated as
a formal notion of location privacy, generating a rich body of literature
building on this idea. A problem with most of these follow-up works is that
they blindly rely on geo-indistinguishability to provide location privacy,
ignoring the numerical interpretation of this privacy guarantee. In this paper,
we provide an alternative formulation of geo-indistinguishability as an
adversary error, and use it to show that the privacy vs.~utility trade-off that
can be obtained is not as appealing as implied by the literature. We also show
that although geo-indistinguishability guarantees a lower bound on the
adversary's error, this comes at the cost of achieving poorer performance than
other noise generation mechanisms in terms of average error, and enabling the
possibility of exposing obfuscated locations that are useless from the quality
of service point of view.
