That assumes that the move is a necessity. It doesn't have to be; pure profit motive is enough to introduce the concept preemptively.

I prefer the profit motive over the authoritarian "altruist" motive.

Pessimists before ads: OpenAI is a bubble fueled by dumb money waiting to pop, they'll never be profitable!

Pessimists after ads: Ok it's not a bubble but advertising is evil!

Pessimists after hearing paid subscribers won't get ads: Pffftttt $20 per month??? Profit is evil!! I can spin up a local LLM on my Linux machine for free!

Pessimists after admitting you can just choose not to use ChatGPT, a result of the free market: But I don't like that OTHER people are using ChatGPT because they're obviously dumb if they don't agree with me!