Well there are two ways to look at this story. One way to look at it is the duopoly is "under attack" from different media platforms, which is a frankly boring observation. Tiktok becoming more popular cuts into YouTube ads? Hardly shocking.
Another way to look at it is the duopoly is being forced to retreat into their safe havens, yes that "90%" of their revenue that they can safely take for granted. I would wager on a guess that Alphabet and Meta are not happy if they can only serve ads on their owned and operated properties like google search, youtube and instagram. They are risking losing the wider web advertising market.
