Are "custom audiences" merely the choosing of criteria from the ones FB
offers (as standard)? If so, how is that a *custom* audience?
And, if you ARE (still) allowed to add your own list of gathered (truly custom) IUDs, then where/how does FB expect you to gather them, if you're not allowed to use a UID scraper? If you can insert a custom list of UIDs, how does FB know you didn't SCRAPE them anyway?