Comment by bayindirh

Open Data initiatives generally build upon the premise of immutability.

Data Sets can be alive, i.e. new data can be streamed into them, but they won't be purged, shortened or slimmed down.

You can expect more historical data to be opened as the digitization and organization continues, and don't expect this data to be randomly being removed from archives.

Even going one step further, if this data sets are refined and formatted, they are versioned, so you can always see the previous versions (e.g.: https://www.zenodo.org).

If you're starting to remove any data set from a data pool w/o any explanation and announcement, this means there's a new "Department of Truth" in the works, 99% of the time.