Last year a customer told me about a guy going round offering cleans at half the price I am charging. I told the customer that anyone charging half as much as I am won't be able to make a living out of it.
I've not seen anyone new in the area, so I reckon he didn't make it.
I've no problem with anyone new starting up. I will even give them tips on how they can get started up. As has been said, if customers like you, you are reliable, honest and do a good job for a reasonable price, you have nothing to worry about.
John