I suggest adding help text to the Billing page to clarify exactly what the numbers mean and how AI is billed/not billed, what if any limits there are on use, what happens when you hit the limits, etc. Alternately, provide a brief explanation with links to detailed information.

I'm currently confused, and I don't know where to find the answers. I've tried searching this forum and Kagi but haven't turned anything up.
Am I being charged for using quick answers and/or the assistant? Is it just what it would cost if I wasn't getting it for free? Am I getting it for free with an upper limit on how much I can use it?
My billing page currently says:
AI usage (USD)
$1.40/108.00
Restarts at zero each billing cycle
$108 is a little more than what I paid for the last year, and apparently exactly what I'll pay when I renew. That suggests that I've only used $1.40 on AI in the last 11ish months. However, I'm pretty sure that the $1.40 number jumps up and down each time I look at it, as if it's monthly? So what's the deal? Do I get $108 of AI credits per month? Per year? Unlimited quick answer and assistant use?
If there's a limit, what happens if I go over? Does the AI stuff stop working, do I get prompted, do I get billed?