Corrupting Potion was already barely bought by anyone and then Riot decided to give a huge buff to every starter item…except Corrupting Pot (and Tear).
Even in competitive play it has been a good while since anyone has bought it. And that is where the item was more popular due to the permanent sustain it gave
Why is it even in the game at this point? Riot probably forgot about it in the new season changes as well
You basically get a dose of potion every time you get autoed at low hp with doran shield and second wind lol, the combo is so op you would want it way more than some potions in most ignore opponent lanes