But you can use any ratio you may like, however a higher risk-reward ratio will mean more losing trades and keeping your position open for a longer period of time, and it could be difficult for most traders to deal with the added pressure such a move will entail.
Accept bigger risk means you are more like a gamblers, degen, not like a trader who have careful calculation for your trade and never open a trading position if you see risk is too high and chance to get profit is too low.
Saint-loup already pointed out, risk-reward calc don't work the way you think it does. And if the ratio of 1"3 or whichever you think is accurate, then mathematically you should always be making money as a trader.
Risk-Reward calcs are used by sportsbooks a lot but they actually make money because they track live probability a lot as well, very well. Which I believe trading calcs don't do well.
Nothing always works like you imagine it will work for you and your trading position but the RRR like 1:3 will help you to accept lower risk and at the same time a chance to get good profit. If you see a RRR is like 1:1 or or less than 1:2 or 1:3, it is like not good choice to take risk.
Trading is accept risk. Investing is accept risk but what level of risk you can accept is a matter.