GitHub Copilot's challenge is that they weren't selling access to their own models, they were selling access to models from OpenAI and Anthropic which they presumably had to pay list price for (or maybe a slightly reduced rate that they negotiated).

They also had a pricing plan which they had designed pre-coding-agent, when it was rare for a single prompt to burn $10+ of tokens in an agent loop.

OpenAI and Anthropic are at least selling their own models directly, so they can discount a whole lot more since there's no-one else getting compensated in the middle.