To fight my laziness and procrastination, I just unsubscribed from all YouTube channels and deactivated the app on my phone.
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There are some online services that use email login. This means that instead of a combination of user name and password, only the email address is entered and a login link is sent to it. Basically, this is a good option to increase security a bit. The service only needs to store a list of email addresses instead of the corresponding password (hopefully encrypted and hashed) for each user.
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