I use termux a bit as others have mentioned; not for anything particularly tech-y - I'm poking away at writing a book when I have time and I'm using a self hosted Gogs server to centralize it and keep track of changes, so I mostly use it for a text editor and git.
I have a bunch of self-hosted stuff so most linuxy-things I do I just use JuiceSSH/mosh/tmux and connect to a remote server. This has the benefit that when I get to a computer with a proper keyboard I can just switch over.
Source? I'm really curious to see what they found.