Did big tech just monopolize live audio?

Clubhouse boasted 13.4M users in March, but its new user growth has rapidly decreased since. New downloads peaked in February at 9.6M, but fell to 2.7M in March and 900K in April. Now I know that downloads is not the best form of metrics because it can be a result of hyped marketing but still this seems like a steep decline. Could this be because of Twitter spaces or perhaps FB and reddit entering this market? Because on clubhouse, you have to build a following and community bottom-up but for twitter or FB, you might even have a following already.