I think the suggestion is that the government use of that public data could be such as to create a chilling effect. That is, the upload and interaction of the user with the private company is almost irrelevant: it is just part of the antecedent to the government's conduct.
If you believe the government would only use that data for just purposes then you probably wouldn't then believe that there is a 1A issue. But if you think the government would use it to identify persons at a protest and then take adverse actions against them on the basis of their presence alone (which to be clear, seems distinguished from the immediate instance) you would probably think there is a 1A issue.
If you believe the government would only use that data for just purposes then you probably wouldn't then believe that there is a 1A issue. But if you think the government would use it to identify persons at a protest and then take adverse actions against them on the basis of their presence alone (which to be clear, seems distinguished from the immediate instance) you would probably think there is a 1A issue.