[stordoff]

> userIDs fields on the network requests you will replay with Math.random()

Isn't this _why_ you'd need domain expertise? Random User IDs would be detectable - a French user suddenly clicking on English ads and following East Coast time would be a red flag.

[gcb0]

the beauty is that everyone want to do re-attribution, so they can buy cheap and sell expensive.

if I send a bid to google with a random browser id, it will assign a new user on the spot (we wont be lucky to match a valid user as in your example) and all goes on normally.