I noticed the "O2 Therapy Humidifier" and other components. How does this ventilator fares against a AMBU bag ventilator? Right I'm making an effort to acquire

I noticed the "O2 Therapy Humidifier" and other components. How does this ventilator fares against a AMBU bag ventilator? Right I'm making an effort to acquire DIY to build a ventilator that squeezes an AMBU bag. I found it incredible easy to make and scale, total cost around 300 euros/324 USD.