Bad question. Instead of seeing if the survey is proof or not, we should ask how it can trigger a more in-depth investigation.
A Google Forms survey provides figures but does not reveal the deep motivations or actual behaviors behind the responses, especially regarding identity document verification.
In Portugal, the Chave Móvel Digital is very practical, but membership depends more on trust and education about the tool than on raw data from a survey.
True understanding comes from observing how people interact with these services, not just what they declare.
The third way is to consider the survey as a first step for qualitative studies that explore cultural contexts and local habits.