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Re:Brave launches 1.0 by lonelappde on Wednesday November 13, 2019 @05:36PM (#21530467)
Adjectives modify nouns.

In the case, it's a bit tricky, but "surveillance" is acting as an adjective, more specifically a noun adjunct

https://en.m.wikipedia.org/wiki/Noun_adjunct

Re:Brave launches 1.0 by xkde on Wednesday November 13, 2019 @06:06PM (#21530759)
Except the adjective in this case is sufficient as a noun on its own. Unless you want to bring capitalism in for ulterior motives.