And I wouldn't invest only because of the depreciated currencies.

Is the currency stable?

Some of the guesses are really educated and said with such certainty that you'd think they were prophecy, but in the final analysis we're all looking at the cluster cuss that is our economy, real estate market, and political hoodwinking system and wondering how these factors will play out:The ongoing COVID-19 "war"The changing political scene and their views on housing, job creators, wealth, and a bunch of other ideas that intersect with property ownership and investing.The affect of limitless moneyprinting on our currency and economyThe future of interest ratesThe inflated price of materials for building new homesEtcSo, there is no telling. 

And they claim only a small percentage of crypto is on the internet per se (the rest is locked in cold storage).

Bottom line is that multiple cryptocurrency exchanges pay better interest on the world's most wanted (and hardest) currency, which also has the best annual appreciation record of any asset ever known.

It's a crypto exchange platform.

I was already invested in the land when I was 18.The problem is when you'rr 29 or 39, price will be much higher than now due to currency/valuation/etc.

Perhaps Crypto as it is more liquid than gold but more volitile?

Again, he's going to confidently be able to answer you and by doing so, you'll also get an idea as to the most valuable currency here to employ in getting him to leave - is it money, time, comfort, extra help packing, helping him find the next place, finding his dog a yard, whatever.Do not talk about yourself. 

It's not that there value or price is going up, it's that the currency used as medium of exchange is going down.