I mess about with a bit of gardening and plumbing. I’m about as good as I am at playing the bass. I could charge you money to do it? Or you may just go to a check-a-trade website and find someone qualified, with experience and good reviews.
Pretty much all the musos I know making a living have booking agents and get work via word of mouth in much the same way. All of them started off playing pubs, school events, community type things for free or low pay at some stage in their careers.
I don’t think it’s as clear cut as being made out. There needs to be provision for all stages of a musician’s career.