I live in a region where uncertainties are common and would consider some possibilities that others might not be quick to recognize. I would suggest that you tick these off the list before jumping to conclusions as to your potential supervisor.
Possible Reasons for Lack of Communication
Their internet, computer, or power has failed. Even in Portland, Oregon, USA, thousands of people had a weeks'-long power outage this year due to an unusual ice storm and its aftereffects.
Your potential supervisor experienced an unexpected medical emergency. For example, I had a sudden case of severe keratitis this year which prevented me from doing much of anything with my computer for a couple weeks (everything was too blurry to read).
As it seems highly unlikely that, in ordinary circumstances, someone would go to the effort of making a zoom appointment, communicating the time of the meeting, and sending you a link for it and then just not show up, it is prudent not to simply assume the worst. Try to learn the facts of the situation before making judgment calls relative to someone's character or motives.
You do not know what happened. You have no reasonable way to know why it happened. Until you have more knowledge about both of these, avoid making unwarranted conclusions.