What is Pay To Win?

Josh Strife Hayes Youtooz Plushy! :
youtooz.com/pr...
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What actually is 'pay to win', can we define it, is your understanding the same as mine?
Or is it a sliding scale of design where money can effect a game more and more?
let's find out.
A big Thank you as usual to the supporters on Patreon and Twitch who keep the channel alive.