RE: just some facts24 Jun 2021 15:05
"Presumably people only bought into HE1 because of the belief it would strike Helium"
Most investors are motivated by profit, and not losing too much, rather than discovering Helium. Initial investors will be out in while or part by now, taking their profits on the rise in anticipation of drill results (irrespective of discovery), and move on to another venture, but they may also have options to come back in later at discount prices (winning both ways).
As others have said, it's a risky investment and there's still a lot of risk in it. If there was no risk then you can bet we'd all be paying the unrisked price for shares at this point!