Few people, even in decently earning roles like in tech, will have the runway to try and make something successful on their own all of a sudden after job loss.
Starting a freelancing practice is more likely to bear fruit, but it's a very different ballgame of overheads than "just" the core job itself, if you want to get the full rewards of being a freelancer.
"Making money is easy, just go out there and make money" is effectively what you're saying.
It takes time to find and execute these ideas. Yes the tech can be cheap, maybe even building it can be cheap, but the time to grow your customer & client base from scratch can be highly varied.
If it were really this easy, you'd have every person on IndieHackers having ditched their jobs already because their ideas have taken off. Yet very few have.
Go out and execute, yes, but it can take many iterations to get anywhere.
Even Pieter Levels has about a 10% hit rate on his projects being successful.
I think you're being pretty dismissive here. That person is talking about someone who currently isn't working and is struggling to find work. "idle bandwidth". Nobody is saying it's simple or easy, but if you're in this field you have the skills to at least try. I've been laid off for 9 months so I understand the toll it takes mentally, but having a pessimistic attitude won't help you in the short or long term.
Starting a freelancing practice is more likely to bear fruit, but it's a very different ballgame of overheads than "just" the core job itself, if you want to get the full rewards of being a freelancer.