Perhaps your friend has already been informed or even interested about Bitcoin and crypto. The greeting is basically promoting Bitcoin and crypto.
However, the line "invest in Bitcoin and cryptocurrencies" is just like the tiny tip of something enormous. It entails knowledge; it entails careful research not just of Bitcoin itself but also of how to securely access and keep it.
There must be serious disclaimers following this encouragement or, better yet, precautionary warnings. This is the overused line of scammers soliciting investments from gullible individuals in the name of Bitcoin and crypto.
Same thought actually, this kind of things usually comes from scammers. They used this short quotes that can fool those who are willing to earn a lot of money. I hope if we are sending this short quotes to our friend, let's try to elaborate more. Cause this can overhype people thinking that there are no risk in this currency. They don't have to get in right away, or invest right away. I think they should understand the currency better then decide if they are willing to invest. Cause if they lose their money, the image of bitcoin is the one who will suffer, cause they will now see it as a scam in general, making it harder for bitcoin to be seen as a decent currency.