A Scout making a campfire shouldn’t be a civ specific technology. It should be allowed for all civs so it will be used more often. Right now it is a forgotten ability coz it is only encountered in English Scout and usually only one scout is made per game. Since devs have put effort in making the ability it is such a shame being forgotten. Feature such as this can add more room for creativity to the game and entertainment for the viewers.
However it can be nerfed to camp fires only staying up 1-2 minutes before being put off if no allied units in the range. that way all scouts can use it to monitor for trade or out resources.