I have brought up this issue many times in the past of questioning the purpose of adding a ONS sticker (and hence, category) to every profile with the same surname.
If one wants to see everyone with the same surname, you do NOT have to create a category for it and place everyone in it. All you have to do is to go the surname table itself and you can see everyone there with the same surname.
Based on that idea alone, the ONS sticker should NOT be automatically added to any profile with the same surname.
Going beyond this, every One Name Study will want to define the scope of their study, and the methods they want to use to support their research. Some people will want and need to put everyone with the surname in a category, but in a category that has location information. Other people, like myself, are only interested in using the sticker for those people who are currently unconnected to the main family / families, and for those at the top of those families (progenitors).
The point is that there is no "one size fits all" answer. And if there is "no one size fits all", then the sticker SHOULD NOT be automatically placed on the profile. I know that Ian is trying to bend over backwards by providing some spreadsheet to include or exclude surnames. But even that requires additional steps, for an optional browser extension that not everyone uses (or should need to use). In the end, any additional feature (like auto adding a sticker) SHOULD BE OPT-IN and NOT OPT-OUT.