What happens when I keep checking my credit at various places?

Last 4 tweets from premieremc:

It may ruin your credit completely. The more you check it the worse it gets. Even if your credit has been perfect up until now, frequent checks could put you in a difficult position. We check your credit once and we use the same credit report for all the financial institutions where we represent you, this way your credit stays the same. We will even help you improve it at no charge.