Is selling boosting against ToS?

Went up against a team that had 2 plats and 2 golds and 1 unranked (1 plat was peak asc 3, and the unranked was immo 3), and we were 2 silvers, 1 gold, 1 plat, and 1 diamond. At the end of the Immortal absolutely bodying us, he said in chat "Tracker gg I boost people $45/hr". So we went up against them boosting lower ranks. That has to be against ToS right?