What if I start to make enterprise products called Coolduino, and I say "my products are for the Arduino framework ecosystem" - will you come after me?
Not-legally-binding tl;dr The "duino" suffix could be a trademark issue. If you rename it and you keep your hardware designs open source you're fine. Otherwise contact them for a proprietary use license.
CC-BY-SA-4.0, so you also can't claim original creation of it, you have to maintain an attribution to the original creator and you cannot change the license.
https://support.arduino.cc/hc/en-us/articles/4415094490770-L...
Not-legally-binding tl;dr The "duino" suffix could be a trademark issue. If you rename it and you keep your hardware designs open source you're fine. Otherwise contact them for a proprietary use license.