Over 50% of freelancers won't go back to an office job for any amount of money because freelance entails its own set of privileges. As a freelancer, you are your own boss.
I think I agree with that. But perhaps this applies most likely to those freelancers who have long and successfully work in this field. There are many freelancers for whom this is a temporary job for a number of reasons.
why do you think some people are only doing temporary work ? I for example am engaged in web design and work remotely for several years.
It is up to freelancers to decide to work only temporary or permanent. Let's think you got a job to build a website, it will take max 1 month, and once finished you can decide you will find another job or not, if you need to continue you can bid and win another project and complete, get the payment, so on. that is your call, and this is freelancing.