Finally, Clubhouse has opened its services to all users, and invite is no longer required. Originally, the app was iOS users only, creating exclusivity, but after quite a while it finally released an Android app in May. Removing the invite only will also help, but, somehow, I wonder if it's just a little too late and the initial interest may have waned.
Other social media apps are available, including Twitter Spaces.
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blog.clubhouse.com...]
Earlier story
Twitter Spaces Now on Mobile Web and Desktop Web [webmasterworld.com]