In the majority of cases, companies do that not because they need to remain anonymous, but because it's a confidential search, eg. to find a replacement for an existing employee who is about to get managed out.

Occasionally it could be because the company is going on a new market expansion or launching a new business unit and things are still under wraps but they need talent today already. Or due to a new direction that the business is heading towards that hasn't been officially announced to the public or for legal reasons, hence recruiters are not allowed to reveal the company name until they shortlist candidates from the pool of applicants.

As a job seeker, if you are trying to find out if this 'Company Confidential' is really worth your time, do this:

Scrutinise the job posting, see how in-depth the job description is, how well-articulated or presented it is, if the recruiter reveals anything about the industry or market that the employer is in, work culture, organisational values, etc. These are usually hallmark of a reputable and good employer worth applying to even if you don't know who at this stage.

For sure a scam. No company will ever require a candidate or employee to pay money before joining or upon joining.

There are actually plenty of home-based work you can do, try thinking about what you are naturally interested in or have a talent for already. Freelancing work abound on sites like Fiverr as well as other sites more local to Malaysia / Southeast Asia. While you look for freelance work, also think about picking up skills you think might be useful (and again that you see yourself doing a few hours every day as working from home actually requires a lot of commitment and discipline than people think if you really want to make good money).

Alternatively, blog/create content/vlog on Youtube on whatever it is naturally interests you or that you have some familiarity and expertise in.

Sounds like salesperson/promoter-like work in a cultlike MLM setting, which if your son is jobless anyway and looking to earn money while he looks for a real job, would be a great alternative for gaining some useful sales experience.

Believe others have written about it prior, go check out this person's firsthand experience of working there.

https://forum.lowyat.net/topic/4801882

So I'd say go for it, but definitely try out more legit companies that offer graduate trainee programs, entry level roles, internships, contract roles, etc. that are more reputable.