BeReal has a known traffic cap, say, 3 or 4 billions peak connections at the same time.
This cap has already been solved by other tech companies if i’m not mistaken.
1. You have a huge burst but you pick when that happens. That means you can provision the appropriate hardware just in time. 2. Storing and serving images is really easy now with a multitude of satisfactory cloud services that are reasonably priced. 3. You can move stuff to colder storage pretty aggressively.
Plus, people like the overly glamorized ideals of other social media -- even though we all hate it because it's an unachievable ideal, it's more exciting than reality. That's why "reality TV" is simultaneously absolute mind-numbing dog shit and also watched by millions regularly. It's that cognitive dissonance between "this is ridiculous and unrealistic and probably unhealthy to see all the time" and "but it'd be fun to pretend it's real, though".
So I'm not sure they have a platform that's feasible to grow in the first place.