Investing in income-producing financial instruments (stocks, bonds, funds,...) is not taxed if the source is outside of Malta. To be still considered as "private wealth management" one should not buy/sell too often. That is safe.
What S+Rtrader is doing is really trading. This could be considered as running a business. But I assume he got expert advice, that he can carry on his activity in Malta without paying taxes. It always depends on the individual circumstances.
I am an "investor" (not a trader) staying in Malta for 8 years. Started really small (e.g. 230€ rent a month for a flat), but my investments paid off and I hope will still pay off.
