No, it's presentation software that's implemented via a website. The primary user of this software is the person giving the talk, not people on the internet. The fact that people on the internet can also see it is a bonus that comes with the choice of the implementation.
Complaining that this doesn't work on mobile is like complaining Powerpoint doesn't work on mobile.
Complaining that this doesn't work on mobile is like complaining Powerpoint doesn't work on mobile.