They seem to going after the same demographics which is always a tough battle.

I hope clubhouse can find a niche that they can own. It's always tough seeing hard working founders get copied then killed by big tech.

Was big-tech responsible for the clubhouse 'demise'?

Another theory is that is was a gigantic product/market 'misfit'. It didn't get the traction (nor the user engagement) to make it successful. Not Clubhouse and not a single copycat.

When big tech copies and kills a startup usually someone wins the battle