I just got an email from Mbed this morning, announcing they will stop supporting the tech in 2026.
https://forums.mbed.com/t/important-update-on-mbed-end-of-life/23644
I have an Mbed board, and I quite liked it and the platform, but I have to admit I never did much with it, and I mostly stopped using MBED shortly after checking it out.
One of their reasons is that Arduino, etc now covers the things MBED was built to solve. I’m guessing those boards are now programmable with the Arduino IDE?