I have customized the existed theme (Technews) to something like my website's theme (https://www.hackerminded.com).
1: Can I use it for my own commercial website?
2: Is it legal or illegal?
Yes, you can. All our themes are open-source and free. You can use/modify it the way you want.
--Do you appreciate the support you've received today? If so, consider donating to the Publii team by clicking here; we'll be sure to use your donation to make Publii even better!
Wow, is that a Publii-website? Amazing!
It is not live yet, but I have customized as same as this one.
Soon I'm going to make it live.
I'll let you know after publishing it.