400mg is a massive dose and unless you have a serious issue with narcolepsy is too much.
Who cares what the manufacturer’s MAX safe daily dosage is. Use some common sense.
I would never take more than 100mg a day (usually 25–50mg is more effective).
Laughable. The impact from digital nomads is so minuscule it is not even worth talking about (which is why governments haven’t bothered to regulate them). The real group causing gentrification in these poorer countries (mainly referring to Asia) is China.