As students, they don't have to focus on investment because there are more important things for them to do. Learning, finishing their education course and getting a degree which are all more important for them at this period in their lives.
Lives are so long for them to start investment anytime and opportunities are always there in the market. When they get a degree, find a job, get salary, they can have savings for investment, it is never too late.
They can do e-learning with free sources on Internet and find jobs in cryptocurrency but it's not main focus for them. It should be their part time activities when they already fulfill their learning at college or university.
Cryptocurrency job listThat's why I never advocate teaching bitcoin investment to teenagers, especially students, there are many things worth learning and many things they need to learn to prepare for a future. Bitcoin is just an investment like many investments like gold or stocks, it is not an essential thing that anyone should have because many people are still rich without knowing what bitcoin is.
But in the scenario OP gave, I would support them saving money to invest in bitcoin instead of using money their parents gave them to use stimulants like cigarettes or alcohol. It not only affects their learning but also affects their health, and even destroys their health and future if addicted.