Their fees have always been voluntary/donation-based. With more economic activity as price rises (as evidenced by higher BTC transaction fees) it stands to reason there'd also be more users using ChipMixer. But it might not all be 1:1, and seeing that DarkStar_ has merited suchmoon, the participants of this campaign should be prepared for reductions in rates paid. The 2nd highest paying campaign pays barely more than half what ChipMixer pays per post but with a smaller weekly post limit, and the 3rd highest is some shitcoin campaign with $6/post but with an even lower weekly post limit, and none of them are accepting new members.