In France for example, this activity was under scrutiny for decades (2014: https://www.lemonde.fr/vie-quotidienne/article/2014/02/12/de..., 2022: https://www.francetvinfo.fr/internet/telephonie/demarchage-t...), and even if the law is now more restrictive than before : - no week-end call - calls from 10am to 1pm and 2pm to 8pm - you can be included in bloctel, a "do not call me list" it still leave room for this activity.
Almost all these jobs will probably be replaced by AI in a near future, so the main leverage will disappear and ...