To explain anyway: As a contractor with a limited company, I have two options when it comes to moving money from my company to my personal account.
1) Set my salary to be the same amount as the money I've earned from contracting, thus paying the same amount of tax as a "regular" PAYE employee who works full time
2) Set my salary to be minimum wage and pay everything left in my company account as a dividend, resulting in paying less tax.
My point is that option number 2 is "tax avoidance exploiting legal loophole" or "sensible tax practice" depending on how you want to frame it. Businesses will use whatever legal options they have to pay the least amount of tax, including small businesses (although small businesses might not even consider that they're already doing it).