Indeed, the best metric is some sort of cpa media buying experience.

I have the following channels:

- twitch, good roi, short lived - affiliate forums, long lived, breakeven roi - youtube, fb, ig, cant ever recover investment, only good for content creation - ad networks and tik tok , totally 0 conversion rate even at what appears to be tremendous amount of traffic.

So yeah, if you arebin my niche a and a million views does not convert, then that algo and the platform are useless.