Most people does try to run a business if they get sucess they are free to left their jobs, talking about casinos, dices, exchanges, online wallets, and few more projects around. Outside those you will be able to earn some extra coins doing signatures and some tasks, but you cant and shouldnt left your work to focus into bitcoin, there are risk wich you cant recover if something goes wrong, soo consider bitcoin and crypto as extra source.
No, the risk and willingness to stick for full time with the profitable business are not just newer things that we are seeing only due to bitcoin ecosystem. People do switch over to new business when when they are finding satisfaction they may take decisions to stick with for full time.
The risk you are mentioning about bitcoin based business should be taken for considerations due to the fact bitcoin is newer inventions. But almost all the business even jobs are at peril to go negative in abnormal situations.
I guess embracing bitcoin related business/job for source of income must be a good option for any country people as I do study about the opportunities, it is wider and capable of supporting for living if we are enough dedicated.