How did that change-set get to cover across large parts of Eurasia?

Somehow this change-set got a little bit big.

Please keep single change-sets local if possible, to avoid spamming the history feed over large areas.
osm.wiki/Changeset

Thanks and happy mapping

Please keep single change-sets local if possible, to avoid spamming the history feed over large areas.
osm.wiki/Changeset

Thanks and happy mapping

Please keep single change-sets local if possible, to avoid spamming the history feed over large areas.
osm.wiki/Changeset

Thanks and happy mapping

Please keep change-sets local, to avoid spamming the history feed over large areas. If you edit small areas over a larger range, it is better to split the edit into multiple different local change-sets.
osm.wiki/Changeset

Happy future mapping

Please keep edits local, to avoid spamming the history feed over larger areas.

Thanks

Please keep edits local, to avoid filling the local history feeds.

Thanks and good future mapping

If possible please keep edits local. That way you don't spam the history feed-globally.

It happens to the best of us. No worries.

And happy future mapping

Please try to keep individual changesets local, as to avoid spamming the history feed.

Thanks

If at all possible please make such geographically distant edits in multiple local change-sets to avoid spamming the history feed for everyone.

Thanks

Please keep individual change-sets local. Such large change-sets spam the history feed

thanks

Please keep individual edits local to avoid spamming the history feed all over the world.

Please keep individual edits local, as to avoid spamming the history feed all over the world.

Thanks

Please keep individual edits at a much much smaller geographical scale, as to avoid spamming global history feeds

Ok that explains it.

Please make sure to avoid change-sets that cover such a large area in the future, as that both sets off quite a few alarm bells and spams local editing history feeds, thereby making it harder to find edits in areas.

Happy future mapping

Danke sehr für die schnelle Antwort. Und weiter fröhliches Mappen

This change-set looks like an accidental mass deletion on a large scale.

What happened here?

Something went very wrong here. A mass deletion over this large of an area is highly indicative for either something going wrong with the editor or vandalism.

What happened here?