There are a number of organizations offering free online tutoring, such as https://learntobe.org. https://weteachscience.org used to provide free STEM tutoring to students in disadvantaged schools, but they recently shut down...I think it was difficult getting stable funding.
There is no technical reason why high quality tutoring couldn't be offered to all these students. It's simply a matter of arranging the funding. I think a workable non-profit business model would be to arrange long-term funding from some government organization. If anyone is interested in setting up a business like this, feel free to email me and I can provide contacts and technology (I work with online tutoring companies, including the two listed above).
