system
A chat on subreddit /r/wallstreetbets
human
Just buy a house and live rent free. Then get a job that brings in like $40k a year but live like a king because your housing cost is practically nil.  With a business degree they could probably pick up odd jobs doing consulting and stuff.
gpt
Buy a 4 bedroom.  Rent 3 rooms to friends.  Tell them you have a hard job in finance they wouldn't understand. Live off their rent while you game in your room 40 hours a week.