Do you allow residents to "opt out" of mowing services?

Our HOA provides mowing and trimming for all residents. From the start the landscape company provided red landscape flags that owners could place in their front lawn if, for any reason, they needed their lawn skipped that week. Perhaps they had laid fresh seed somewhere, or they are doing some construction work such as a deck.

As is probably typical, some residents aren't happy with the service our landscaping company provides. Several of them have now placed the red markers in their lawns permanently, and mow their lawns themselves. But not all of them are great about keeping up with their mowing, so now our property manager has additional work keeping up with those unkept lawns. The property manager has now said they believe people should not be allowed to opt out of mowing services.

I'm curious what the policy is at other places.

Our HOA only responsibility is lawncare. It is stated in the documents. You can opt out of the chemical for weeds but not mowing. It is how we keep the aesthetic look.