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@k1ooo-slr-sales wrote:

   watchcount, however, opted everyone IN without member consent unless the member contacted them to opt-out.

and the watchcount site still displays how many members had opted out . . . . . . 187 out of the many many millions of eBay members.

I think it would be safe to say that this number would have been significantly higher, possibly by a factor of over 1000, had eBay sent a message to all their members giving them a link to watchcount so they could opt-out if they chose to.  They can, and do, currently send messages via eBay messages to every member, so this is possible.

I was being conservative with the factor of 1000 as this would only mean that 187,000 would have chosen to opt-out, but I reckon world-wide it would have been in the millions had ALL members known about it.