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Re:New LoRa RF distance record: 1336 km / 830 mi by paulsutter on Thursday September 07, 2023 @05:30AM (#37416577)
Jacques’ point is spot-on, regardless of your fine distinction to call it spam instead of astroturfing
Re:New LoRa RF distance record: 1336 km / 830 mi by SahAssar on Thursday September 07, 2023 @07:18AM (#37417321)
If the content is good and nobody is hiding their affiliation with it then the correct word is just "posting". Otherwise it might fit within one of the categories you mentioned.

I agree that it would be better if they were up front with their affiliation, but hiding it (astroturfing) is not the same as not divulging.