What are the CS:GO weapon drop rates? Does the drop chance on an achievement idle server go down if you're idling?
Supposedly, the system has changed and idling won't get you items, something I have observed to seem true in the game. I don't think you will ever get the formula, it is a secret and information won't leak because weapons can be monetized.
Related / Duplicate : How do I get item drops?
Edit : I forgot to mention it but the drop rates go down over time, if you have like X % chance to drop an item per game, it will decay and reset to X % at the end of the week. This ensures people don't spend too much time farming weapons, or find new ways to idle, probably.
Not going to lie, I was idling last week and still got item drops so it does still give you items, just not as often.