Since Dec 2017, Twitter has not allowed you to pick your username during the signup process. Usernames like "jsmith12345678" don't indicate you're a bot. They just indicate you're not very social media savvy. My new writeup with UI screenshots here:
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When we dismiss an account as a bot or troll based SOLELY on the account having 8 digits in it (a VERY common rule of thumb in interviews I've done with Twitter users), we are necessarily going to blanket dismiss a lot people for not being super technical or savvy.
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Hey there! What do you need exactly? The formula is documented in one of the quick papers I wrote about Snowflake. (Located here: docs.google.com/document/d/1xV)
(There are some Python code examples as well -- but let me know if you need anything in particular!)