I think, you are doing a great job that will make people around your environment to love you as a good man or woman in the society because what you did to all those students by giving them $20,000, it will make them to do everything possible within their power to have the knowledge of Bitcoin.
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I will correct your point with $20,000, that's too much man, the OP just said
$20 for 5 random students.
If a teacher gave $20,000 in Bitcoin it would be amazing.
But in fact, it's only $20 and that's so they can learn to invest in Bitcoin starting from a small nominal.
I sent the Bitcoin to Thier noncustodial wallet and also enlightened them on how to manage Thier wallet
What do you think!?
Great start for them and you are a teacher they will remember as they grow up, but there are some things you have to control and preferably it is sustainable for them to buy more bitcoins.
As a teacher, you have to set a good example and provide knowledge that they have not learned such as how to invest in crypto.
If this knowledge about Bitcoin is sustainable, of course, they will gain full knowledge and will be the knowledge needed when they grow up.
But about the risks that will occur of course must be told too.
Make sure they know what risks will occur so that they can be more vigilant and not get caught in mistakes that will make them experience losses.