What makes a mover "professional"?

Small Moves truck

I saw this truck today. The terminology is confusing.

I think we can define "Experienced", and there may even be a way of categorizing and quantifying it. Over one year of experience, over two years etc.

But how do we define "Professional"? All that word means is that someone is paid to perform the task. Since no moving truck is staffed by volunteers, any moving company can make the claim that its movers are "Professional".

"Experienced, Professional Movers" is probably supposed to be a reassuring term, but lacking any objective justification, it is pretty meaningless.