Using an API key is orders of magnitude more expensive. That's the difference here. The Claude Code subscriptions are being heavily subsidized by Anthropic, which is why people want to use their subscriptions in everything else.
Be the economics as they may, there is no lock in as OP claims.
This statement is plainly wrong.
If you boost and praise AI usage, you have to face the real cost.
Can't have your cake and eat it, too.
They are subsidized by people who underuse their subscriptions. There must be a lot of them.