You really need to read up because this YouTube junk is poisoning your ability to think rationally.
Now multi-billion? No. For chemtrails to be real it's a multi-trillion dollar undertaking. Nothing in aviation is cheap. Everything is unbelievably expensive.
In order to produce "chemtrails" that have the same volume as contrails you would need to have an equivalent amount of whatever loaded into tanks as there is fuel. Do you have any idea how much fuel is loaded into a passenger plane? It's tons. A 787 contains around 33,000 gallons of fuel, or about 162 tonnes.
Now you're telling me they have to sneak on another ~160 tons of chemtrail stuff somehow without anyone noticing?
And why? For what? Who benefits?