>> In some countries, Bitcoin has been outlawed.
Very few. In more/most it's just taxable.
>> They also endured 90% drops in value from early peaks to troughs. Bitcoin could have gone to zero at any point if the system had failed. (It still could)
OK, sure, but again not a massive risk if your initial stake was tiny.
And it was a stake rather than an investment - it's not really an investment as you're not investing in a productive endeavour. More like buying and holding an asset.