I've used this and it's a great idea, and works well in some contexts.

One downside to be aware of is that it routes your slides/screenshare through your webcam video feed.

In some apps (e.g. Teams) this can dramatically reduce the quality of the slides, relative to a 'normal' screenshare.

There's a setting in Teams to increase video bandwidth, which mitigates this a bit. But the slides will still look less good (at least, that's what people have told me).

There's also a mix of compatibility - generally if you access the video conference in your web browser it works (because the browser can see the 'software' webcam they've set up), but the software webcam is inaccessible in some desktop apps.