I don't think there is any method to acquire a valuable asset for free
I don't think it's really possible to get any kind of valuable and worthy assets for free unless you do something they ask you to do for them and your work is worth paying some assets because nothing comes for free unless you are the product which means even if they promise to give you free money or free asset the asset if actually no free buy it comes from the job they want you and doing this job sometimes doesn't worth it.
While nothing might ever be truly free, as all opportunities require time at the least.
How about some of these other attempts at acquiring free assets?
Modern Day Treasure Hunter Finds $1,000,000 in a Year! (Best Finds of 2022)https://www.youtube.com/watch?v=aKyHloj18wM(This youtuber dives in oceans, lakes and streams collecting whatever lost items he can find. He claims to have *acquired*
technically more than $1 million in free assets for 2022.)
Finding Gold In The Richest River On The Island!https://www.youtube.com/watch?v=1zFhwi48REo(This youtuber collects free assets like arrowheads, gold and minerals in the wild and seems to do ok from a financial perspective)
One thing for sure, crypto mining was not free and it will never be considering the increasing cost of electricity.
Regions like venezuela once offered free electricity to residents, which was used to mine crypto back in the crypto mining golden age.
hydrogen you skipped one economy of the bulldozers
you mentioned scrap metal which is pointless economy when it comes to transport cost of said weight
however. selling PARTS to other miners is lucrative
Try looking at shipping prices of items on ebay.
It is possible high cost of shipping is restricting everything.