Do Most Subreddits Prevent New Users from Participating

I embarrassingly only realized today that for the last week I've been commenting and posting on a new Reddit account and none of my posts show up so I've been talking to the void.

I created another new account to test it and noticed the same thing.

I guess most subbreddits disallow new accounts to participate in their boards.

So this begs the question, how do new people join the club? Is it because I don't use their app maybe and browse on the computer?