I don’t think it’s the individual with a single account that precipitated this change, it’s the users with many, many 20x accounts. Anthropic is less clear on their limits, but they have never given bonus usage, so again OpenAI is the late follower (as with adding a 5x plan).
Pro 100: 5x usage, $100
Pro 200: 10x usage, $200 (previously was 20x usage, $200)
Pro 500: 25x usage, $500
So, essentially scaling is equal. You get the same amount of usage from 25 ChatGPT Pro accounts as you do from one Pro 500 account.
It's fair, but a big of a rug pull considering how good of a deal Pro 200 was.