Sorry, but I disagree. Working for free is a disease. Once people know you are willing to do it for free, that's what they will always expect from you.
All work must be paid no matter how shitty the job was done.
I started out working for free, and it took me a couple of years to shake it off until I was finally being paid accordingly, up until everyone can learn singing, recording, mixing, mastering and publishing their work on YouTube, social media and even Tiktok, that me and my fellow other engineers are no longer needed. Commercial recording and project studios went out of business one by one, and the recording industry in this country eventually died. There are still a few in business, but I don't see them doing any work. Just a leftover pride living on the memory of the good old glory days and can't sell the equipment, because nobody wants it (or can afford to buy it from them anyway)
My last job before Covid hit us hard was teaching audio engineering at SAE, but now even SAE doesn't offer this course anymore. Only film, 3D animation and game development courses.