Originally there was the concept of reblogging where one site would publish something original and others would publish a small excerpt with a clearly defined link to them.
From there came the idea of the [via] link where another site published its own article based on information from the original publisher and attributed a small link.
And from there it seems like there is just so much republished content that sites think of the information as just public information and glean from wherever without any sort of attribution.
Originally there was the concept of reblogging where one site would publish something original and others would publish a small excerpt with a clearly defined link to them.
From there came the idea of the [via] link where another site published its own article based on information from the original publisher and attributed a small link.
And from there it seems like there is just so much republished content that sites think of the information as just public information and glean from wherever without any sort of attribution.