Yeah to me seems they rather buy data, so in the app I see ads about things things I've looked for somewhere else. Never seen it other way around, but maybe it

Yeah to me seems they rather buy data, so in the app I see ads about things things I've looked for somewhere else. Never seen it other way around, but maybe it is more subtle - YouTube Shorts and TikTok have a huge overlap in content for me, but does it mean YouTube buys my data from TikTok?