Because they are scared that is main reason ,they see that bitcoin becomed ilegall in some countries and also bitcoin is good for normal pupils so they think that our coutries will not allow that cryptocurrency but that is wrong some countries will not support but most will support bitcoin but also some countries will have own unique nathional cryptocurrency like Sweden and Norway.Bitcoin can die only with bad laws in most world countries which dont give to pupil access to bitcoin and also if new bitcoin cryptocurrency enemy coin come better than bitcoin and also if something come what is even better than every cryptocurrency.