Someone I know has these weird entries in their #Authy app under a section labeled "authy accounts". These seemed to already be present when they created the Authy account, and they can't seem to remove/delete the entries. I don't have anything similar in my Authy, only the next section, "authenticator accounts", so I have no idea what these are, and the generic names makes web searches difficult.
I'm hoping someone out there who uses #authy or is knowledgable about #2FA or #infosec can enlighten me (so please boost if you're connected to such people).
It looks like maybe there are some services/sites that partner with #Authy to provide #2FA based on your phone number (distinct from the more standard TOTP), so if you've got accounts on those sites setup with your phone number and then you setup an Authy account with that phone number, these are already pre-populated. I'm basing that on these two Reddit posts:
https://www.reddit.com/r/2fa/comments/o8izzb/can_anyone_explain_the_difference_these_two_types/
https://www.reddit.com/r/CryptoCurrency/comments/8szsbx/authy_is_an_awesome_app_but_there_is_one_major/