Part of my justification for spending $20 per month on ChatGPT Plus was that I'd have the best access to the latest models and advanced features. I'll probably roll back to the free plan rather than pay $20/mo for mid tier plan access and support.
In the past, $20 got me the most access to the latest models and tools. When OpenAI rolled out new advanced features, the $20 per month customers always got full / first access. Now the $200 per month customers will have the most access to the latest models and tools, not the (now) mid/low tier customers. That seems like less to me.
They probably didn't pay for access to a certain version of a model, they paid for access to the best available model, whatever that is at any given moment. I'm reasonably sure that is even what OpenAI implied (or outright said) their subscription would get them. Now, it's the same amount of money for access to the second best model, which would feel like a regression.
Did you read the post you're replying to? It's very short. He was paying for top-tier service, and now, despite paying the same amount, has become a second-class customer overnight.