What amount do you classify as much capital. To start your investment you dont need an actual amount to start it, all you need is a stable job, an income, and a discretionary income from your actual income. With time you can have more passive income to increase the percentage of your discretionary income you do invest with, that is if you are using the dca strategy. However, most rich people prefer to lump sum, since they do not want to hesitate in having a good amount in their portfolio
You don't need a stable job to invest. You need a source of discretionary income to invest. There are many people whose source of income is not stable. You need to find discretionary income from your source of income.
There are many people who invest but they don't have a stable source of income. For example, when a contractor takes a job, you don't get paid until the work is completed. There are many types of jobs where you don't get paid until the work is completed. If they want, they can find discretionary income and invest through proper financial management.
You are absolutely correct, stable source of income is not a criteria someone ought to meet before they can invest in Bitcoin but it is good to have a stable source of income because if you are focused and determined to hold for long time, stable source of income will help you get there ( desire target) without much pressure because you will be able to allocate funds to different needs and wants and at same time grow your discretionary and emergency funds because these two are the ultimate for a healthy and smooth investment but regardless someone without this stable source of income can still do all these if they are very conscious about their investment and how to use their funds.