Ueber: What's wrong with advertising the store?
tfishell: We're all bitter cranktchety disillusioned young-old men here so it's obligatory to complain ;)
I do think Wishmaster777 may have a point about the ads reaching people who already use GOG.
Not that easy though. The algorithm will feed people ads based on observed behaviour, preferences and predictions. Theoretically, you could try to stop customers of a store seeing adverts for that store by using tracker cookies, but that doesn't work if people opt out of tracking, delete cookies etc. Also, you then might miss out on targeting people who buy from Steam and Epic as well - who might benefit from a targeted advert saying "You can get this from GoG".
At the end of the day, advertising works - I don't mind GoG getting on the bandwagon. People may object to using Google, Amazon or Facebook's systems to do it - but opt out of those and you're in with the very niche players who just don't have the reach or the clout.