No they are not and explicitly banned in some country. The strobing light is way more blinding for any other user of the road. It also makes it hard for you eye

No they are not and explicitly banned in some country. The strobing light is way more blinding for any other user of the road. It also makes it hard for you eyes to adjust. This means that you struggle to understand how fast the bicycle is moving, and exactly how its moving (and therefor anticipate their movement correctly), but you also get blinded which might prevent you from seeing other user of the road (especially pedestrian and other bicycle). With strobing light, you not only putting yourself at risk, but every other user of the road.