As with most things both law-related and US-related, it depends. This type of scam would not work in the majority of states due to various laws, regulations, and bookkeeping (it would be nearly* impossible to sell land you don’t own in California for example).
There are other states (and countries - I’m looking at you Canada) where fraudulent documentation and virtually non-existent title checks allow this kind of fraud to persist.
[*] yes - virtually, not completely. It can happen, but the laws are set up such that the land owner will retain their land, the title fraud victim will be made whole financially by a title insurance company. What this means in practice is that title insurance companies make sure every transaction is legitimate and people don’t have to worry about it.
Fraud is always fun to look at because people are constantly looking for those little windows of trust that end up forming in these flows because otherwise everything would take months to execute upon.
[0]:https://mainichi.jp/english/articles/20181121/p2a/00m/0na/00...
Since a lot of people are doing all cash (non-financed) deals lately, I could see how a scammer and a lax realtor could possibly scam an overzealous buyer out of the full amount.
Again - it varies state to state, as the constitution dictates.