So are Cygwin and WSL, though, for those who don't already have the luxury of being on Linux or UNIX (incl. MacOS). I'm sure there are uses for running full-system emulators inside a browser, but access to bash and sed and gawk doesn't seem like one of them. Seriously, if that's the best way to get access to good text manipulation tools, why aren't you ditching your entire OS?
Because bash and sed and suchlike turn out to be the most useful tools for unlocking the abilities of AI agents to do interesting things - more so than previous attempts like
MCP.
