It allows for modifications and commercial use: https://creativecommons.org/licenses/by-sa/4.0/

>You are free to:

>Share — copy and redistribute the material in any medium or format

>Adapt — remix, transform, and build upon the material

>for any purpose, even commercially.

Compare this to the latest release from StabilityAI lab DeepFloyd, "IF", which in addition to various restrictive clauses strictly prohibits commercial use: https://github.com/deep-floyd/IF/blob/develop/LICENSE-MODEL

Repl.it's release is as open as it gets these days, in my book.

It's a copyleft license; and lots of folks on HN seem to think that copyleft, while being open, isn't business friendly.

Wow! I sincerely wonder how all those folks manage to do business in the tech industry without ever touching Linux, Git, Bash, GCC, glibc, WordPress, Ansible, Grafana, MongoDB, 7-Zip, Vim, Emacs, Firefox, Thunderbird, StackOverflow, Wikipedia, most web fonts, most ad blockers, and all the rest!