And with a game like Lol, where it is literally pay to win, I wouldn't be surprised if it were more.
When I used to play LoL, like 5-7 years ago, I was playing a rate of like 3-4 hours daily, which barely scraped by the amount of essence needed to buy the next releases champion, let alone the runes system they had introduced at the time (don’t know if it’s still around) which had a fairly dramatic impact on the early game especially for specific characters.
That is, while technically the game could be played purely on free tier and eliminate any competitive advantage… it requires a lot of effort to keep up. Not nearly as bad things like FarmVille used to pull, but definitely enough to say that ponying up cash is eventually needed.
And having more options available to you (both characters and runesets or whatever they do now) is definitely an advantage, and a significant one at that
I had a lot of luck with Sona, for instance, who I got for free right away.
(Sometimes I think it would be fun to play League again but I can't stand the thought of being tied up for 45 minutes)
Unlocking new characters with RMT is not pay-to-win, because all the characters are obtainable for free without requiring unreasonable effort. You're not forced to get them from random lootboxes like Gacha games, and having every character doesn't give you an appreciable advantage except at perhaps the highest level of play.
Edit: Further, here is an article[1] breaking down how long it would take to unlock all champions without paying money. 9.5 years playing 1 game/day. It's absurd to pretend that isn't "pay to win". By that definition, Clash of Clans isn't pay to win either, because technically you could grind the game for 100 years without paying for anything and get really far.
[1] https://www.dexerto.com/league-of-legends/lol-fan-works-out-...
At 1 game a day, it will take you far longer than 9.5 years to learn to play every champion in the game, so it is irrelevant how long it would take to get all of them. You could play more than 300 hours on a single character before it would benefit you to add a second one.
Best players in the world start new accounts with no champions and are still able to climb to the top of the ladder.
Also, since a few years the game literally give you tons of content such as champion and cosmetics for free.