That begs the question, does admin has access all of our data?
Yes, of course… The data is on his server, he has access to his own server and everything that’s on it. This is true for any online service whatsoever, the only exception would be encrypted data.
If he wants, can he sell the data to some big corporation?
Not legally, unless the privacy policy is changed.
The answer is always yes for hosted services. The data has to be stored somewhere, and it is readable if not explicitly encrypted on your device before being send to the server. Some things like passwords are usually handled differently though, they are not readable by anyone.
That’s one of the reasons why picking an instance is a big deal. You trust that instance with moderation and handling of your data. If you’re not comfortable with any instance then you should look into hosting your own!
That begs the question, does admin has access all of our data? If he wants, can he sell the data to some big corporation?
Yes, of course… The data is on his server, he has access to his own server and everything that’s on it. This is true for any online service whatsoever, the only exception would be encrypted data.
Not legally, unless the privacy policy is changed.
The answer is always yes for hosted services. The data has to be stored somewhere, and it is readable if not explicitly encrypted on your device before being send to the server. Some things like passwords are usually handled differently though, they are not readable by anyone.
That’s one of the reasons why picking an instance is a big deal. You trust that instance with moderation and handling of your data. If you’re not comfortable with any instance then you should look into hosting your own!