Alliance Block market cap is very low, projects with very low market cap are called degen by many and they are very risky, remember Gala games? It was hacked and all tokens were reimbursed, if Gala was a very small project I don't think they will do the reimbursement.
Looking at the story and so many red flags alert so they should be aware from it and take the action around this. This is why if it's unknown coin with low cap and gamble your money hoping to get return in next bull run with low cap is just too good to be true especially in current condition. I don't know why your brother ended up investing on that particular project, maybe he knows the best I guess?
Usually, people invest in a low cap coin hoping that one day they will get their profits like 10x, 100x or more.
However, most of these alts will be abandoned even before hitting the trading market, not only hacking or intentionally deserting the project.