[talk-ch] vandalism under the pretense of "simplifying"

[RB]

A user is destroying precise landuse mapping in Wallis. "Simplifying" in
this case turns precise landuse cover into weird angles and destroys the
work done by the previous contributors while harming the OSM database. Such
moves could furthermore clearly be perceived as aggressive.
 Typical examples of the vandalism can be observed there
https://www.openstreetmap.org/way/965324922/history#map=19/46.02973/7.11287

What is the appropriate way to react to such attacks against the project?
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