Just report those people and get them banned. That is just feeding not a legitimate strategy for winning. It isn't hard to tell the difference.
You don't even need to do demolish tank to use this as a situational strategy: you never have.
https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2886218411/40886913?tab=overview
We had no business winning that game against a full build Kaisa and EZ in ARAM with no ADC on our team. When it got to end game I just started ulting past the enemy team and attacking their objectives while my teammates defended ours. If we lose one team fight we lose that game instantly but flawlessly executing a counterable strategy somehow needs to be nerfed.
I watched RNG win group by taking 4 towers, an inhib, and nexus with 4 people, no minion wave, no tanks to take the turret shots, and no baron buff off of a single team fight win before respawns could come through. What really needs to be nerfed is zombie tank Sion's turret damage though.