I've seen some videos on the youtube of guys in the U.K. adding more battery power to their E bikes. One was some ridiculous 90kmh or maybe higher.{Death wish guy} Supposedly if the law finds out of such mods.they've got really hefty fines.

People probably realised 30 to 40KMH is already dangerous enough on a bicycle. As to why it isn't in the news so much now.