until i see this message displayed I can invest without commission or is there the risk that it will become outdated ( the 3BTC quota has been reached and for some reason it is still there)?
It will bring losses to MoneyPot team if they still share commissions with the user while the 'investors profit' is down from the 'investors all time high profit'. Because, they have already given the commissions while the house was making profit. Moreover, MoneyPot bankroll is down 2.7+ Bitcoin now. They will start sharing the commissions again when the ATH profit of investors will be regained. MoneyPot has used the same concept of Bustabit here.
Am not sure the word "commission" written on the screenshot I posted is referred to what you are talking about ( the commission on the profits Moneypot takes whenever tatal bankroll exceeds the previous all-time high and corresponds to 60% of the difference between new ATH and old ATH) : as per my understanding that 3% written there is the "dilution fee" ( set up to incentivize long term investors and to reward earlier investors) that is deducted whenever someone invest into site bankroll.
Maybe using that same definition "commission" may induce in some misinterpretation.