Startup attempting to use drones to plant 36,000 trees a day
This quantity is absolutely nothing. Area of the single forestry, let's say in small Latvia is around 30 000 ha. 1Bn, I assume, is EU milliard. So, drones can plant, say pine seedlings with density of 4 thousand/ha (which is IMHO insufficient), which gives capacity of just 9 ha/day! I can't see anything industrial in that. Chinese mainland reforestation programme plan was 4 mln ha/year 20 years ago. Belarusian Soviet reforestation bot PLA-1 (Designed in Homel) was able to make 12-24 thousand plantings per hour in ... 1977!
What is good in aerial drones - you do not need to remove tree stumps. Makes the whole operation real safer and cheaper. But its capacity is still  vary far from industrial requirements in reforestation.Disclaimer: I majored in Forest Mensuration, and did my engineering diploma in Forest Plantations.