I was really hoping T-Mobile would set up a vaccination site to troll the tin foil hat crowd. They just announced some major 5G promotions and I think this could be a major marketing move for them to combine the two.
You will unfortunately have an awful lot of people taking the troll site for face value (aka "biting the onion") - and by simple statistics, a non-zero value of people willing to act in real life.
Especially Qanon believers have already proven they are willing to commit extraordinary violence, including storming the Capitol and shooting up a pizza parlor. In Europe, many phone and radio towers have been set ablaze. It is very unwise to bait these people.
It is true that we do have people like that. At the same time catering to them will also do nothing and chances are they already made up their minds about getting vaccinated.