Maybe you're right, but I also think the difference is due to how the EU is trying to justify this : they say their IR camera will help lower phone use while driving.
It's very hard to use the same rhetoric against motorcycles, because you actually always need both hands to drive, making phone use far more hard and risky than with a car.
And anyway, most motorbike crashes aren't due to inattention but mostly overspeed, with an IR camera won't help to deal with.
And FYI Marine Le Pen has just been sentenced to a (surprisingly low) fine and a year wearing an electronic tag a few days ago because of her mutiple European embezzlement.
And guess what, judges also sentenced her to an interdiction to present herself to any elections, but said sentence ends before actual French presidential elections in 2027. I'm so mad at this.