  Finite-size scaling analysis is a well-accepted method for identification and
characterization of quantum phase transitions (QPTs) in superconducting,
magnetic and insulating systems. We formally apply this analysis in the form
suitable for QPTs in 2-dimensional superconducting films to magnetic-field
driven superconductor-metal transition in 1-dimensional MoGe nanowires. Despite
being obviously inapplicable to nanowires, the 2d scaling equation leads to a
high-quality scaling collapse of the nanowire resistance in the temperature and
resistance ranges comparable or better to what is accepted in the analysis of
the films. Our results suggest that the appearance and the quality of the
scaling collapse by itself is not a reliable indicator of a QPT. We have also
observed a sign-change of the zero-bias anomaly (ZBA) in the non-linear
resistance, occurring exactly at the critical field of the accidental QPT. This
behavior is often taken as an additional confirmation of the transition. We
argue that in nanowires, the non-linearity is caused by electron heating and
has no relation to the critical fluctuations. Our observation suggests that
similar to the scaling collapse, the sign-change of ZBA can be a misleading
indicator of QPT.
