This type of mentality fails to understand that Tesla cannot be the only company participating in the transition to sustainable transport. They have been quite vociferous about this fact. It's pretty obvious that the transition to electric transport would be slower if all other automakers just rode on Tesla's back when it comes to building infrastructure. What incentive would other manufacturers have to add more charging?Tesla's mission is to accelerate the world's transition to sustainable energy. So everything needs to be weighed against that mission. It's why they provide J1772 stations in some cases - because all EVs support that goal. But just as in my case, there are installation costs associated with a second station, and the wiring of the business may not even support it without significant expense. But the adapter efficiently expands the utility of existing equipment, further supporting the mission.
As for Tesla's intent when they give away Destination chargers and usually pay installation costs as well, just look to what they did in Europe (first 2 are Tesla only, 3rd + are for any EV). It also states on Tesla's web site to potential hosts, "For our mutual customers..."