The author, a former Google employee, has become a full-time independent open-source maintainer, earning a comparable income to their previous job through retainer agreements with companies that benefit from their work. They offer maintenance services, planning, and expertise to these companies, and believe this model can be sustainable and reproducible for other maintainers. The author is sharing their experience to popularize this model and help others adopt it. They have six clients and are making an amount of money equivalent to their Google total compensation package.