I think the people that just copy the POTM are those kind of people that look at Tier lists to look for good champs to play. ADCs for example, it only takes a few moments of thought to realise that the two top ADCs right now are Kalista and Lucian since they have the strongest laning phase; good all throughout the duration of the game and fit in literally any team comp, but 'apparently', from the tier lists that I've seen, Kog'maw is the top, which is stupid since his laning phase is utter shit and it takes until 25 mins to finally become viable.