Every time I try to create a Reddit account, as soon as I make a post or comment the account is immediately shadowbanned. I have tried many combinations of clearing cookies, using different browsers, different devices, and different Internet connections, verified email address or no email address. One thing I haven't tried is using the Reddit mobile app, because it sucks.
I can see this because if I load my profile page from a different browser before trying to comment, it says the user hasn't posted anything. If I refresh the page after trying to comment, it says the user doesn't exist. That's how shadowbans behave.
It feels like Reddit is trying to make it impossible for anyone to make new accounts due to some extreme anti-spam measure. The reason I think this is the result of some extreme anti-spam measure is that it still happens when I create an account that shouldn't be traceable to me in any way (IP address, cookies, fingerprints, time of day, email address).