It is not allowed for any player whom has signed TOS/EULA to utilize two or more EVE accounts inside EVE, simultaneously, unless all of them are Omega status.
Many players ask about this and are surprised to hear it is so.
That they have been breaking this rule all along via various means.
Some of them self-report to not get penalized, but we have no idea how many others are still violating this rule, knowingly or not.
CCPs capacity to regulate, detect and enforce that is very limited.
My personal unsubstantiated opinion, is that CCP is not tracking IPs, does not have automated systems to collate them, or are not acting on that data, to check against multiple simultaneous accounts in EVE, which are not all Omega status in terms of IP or other identifiers.
Before the launcher and client was changed, you had to run multiple clients for multiple accounts. Now, nominally, they all run through the same launcher and client, but there are multiple ways around this.
The Alpha/Omega change was “thumb-tacked” onto the old EVE structure. I would not be surprised if there are rat holes throughout that implementation that complicate CCP detecting whether a player is running multiple non-Omega accounts simultaneously on one platform or several, both of which are illegal.