I travel with Wizzair and what usually happens is one or two people didn’t read the luggage requirements and had to pay extra.
Of course those people were upset and of course the airline companies sell cheap tickets and try to generate additional revenue in a different way. And then it is important to know what you are getting into and what are the risks in doing so.
For me the risk was only the delay in the flight which Wizzair is very famous for and I was willing to go with them even with this concern.
At the end, if you got caught speeding over the limit, with oversize luggage or something else you will be punished and no excuses will save you.