High school student here. idk if coding on mobile will take off in its current form. The tooling works, but it doesn't work well. I can (and have) writen things in the editor on Glitch[1] or in Termux on my phone, but the reduced typing speed for code (you can't rely on autocorrect like with normal text) and the lack of a proper web inspector (I use eruda[2] which is fine but missing features compared to the devtools on desktop browsers) make it frustrating to do larger projects.

[1]: https://glitch.com

[2]: https://eruda.liriliri.io/