Accounts have character slots and when you join a corp, you are often required to provide an api key to show all chars on this account.

Chars have public history of corp membership or pvp fights etc.

So if you roll a char in an acct with other bigger chars, it will come known that you’re a fraud, not a newbie, or you also play as a character that has “interesting” history.

So you spend a few more bucks a month and create a fresh entire account with new slots, etc.