As per the email I received this morning from eBay:
Starting 24th June 2025, items "promoted with a general strategy will use the following attribution definition when reporting sales and charging ad fees:
An attributed sale will be when any buyer purchases the promoted item within 30 days of any click on the ad, regardless of whether the buyer themselves clicked on the ad. The item must be promoted at the time of click and the time of sale. The seller will be charged the ad rate at the time of sale."
So, in other words, whatever ad rate you have set in your general campaigns will be charged on EVERY SALE regardless of how the item is purchased (with very few exceptions).
I will be cancelling all of my general ad campaigns on 23rd June.