Accessing someone's Snapchat account without their permission is a serious breach of privacy and a violation of Snapchat's Terms of Service. This is considered unauthorized access, and it can lead to severe consequences, including the permanent locking or termination of the account and potential legal repercussions.

Snapchat has robust security measures in place to prevent unauthorized access, such as strong password requirements, email and phone number verification, and two-factor authentication (2FA). They explicitly state that they will never ask for your password and warn against sharing your account details with unofficial websites.

Therefore, it is not possible, and it is strongly advised against, to "access people's Snapchats" without their explicit consent and login credentials.

Regarding "Managing Their Streaks for a Day":

Snapchat streaks require both parties to send a photo or video Snap to each other within a 24-hour period. If you were to manage someone's streaks, it would necessitate logging into their account and sending Snaps on their behalf. As established, this is unauthorized access.

While people sometimes designate a "streaksitter" (a trusted friend or sibling) to send Snaps for them if they can't, this is done with explicit permission and shared login information. Even in such cases, it's important to be aware of the security implications of sharing account details.

In summary:

Accessing someone's Snapchat without their permission is against their terms of service and illegal.

You cannot "manage" someone's streaks without logging into their account, which requires their password and potentially 2FA codes.

Sharing your Snapchat account information, even with a trusted person, carries risks.

It's crucial to respect digital privacy and adhere to platform terms of service. If you are concerned about losing a streak, the best course of action is to communicate with the person you have the streak with and try to send a Snap within the 24-hour window, or if truly unable, accept that the streak might end.