It's true, that's why someone is asked not to use other users' predictions and analysis results as investment and financial advice. Predictions are your way of looking at what might happen in the future, but at least a good prediction must be supported by data and analysis. Not all predictions are correct, but some predictions are close to correct even though they are not accurate.
We do not ignore other people's predictions and results but make alternative sources to support strengthening your analysis, but make sure you get information from trusted sources and professional traders, but whatever prioritize your opinion in assessing market movements and always actively follow trusted information because market movements cannot be separated from the influence of the latest information that we did not expect before.
*What could possibly be the gains of pumps for any new or old cryptocurrency like Bitcoin?
Your question is a bit unclear for me, but I will answer it as I understood. When the market is going on a bullish trend, which means many good news released and many new investors joined and bought more coins. Your gains are dependent upon the amount of your coins you have bought before the price went up, and also the coin you have chosen.
I understand the above statement from a different perspective about market pumps that can affect new coins and old coins like bitcoin, the main crypto market is based on the entire price movement of bitcoin so some other altcoins that still gain trust from investors follow the increase, but not all potential altcoins experience an increase when the price of bitcoin increases or the price of bitcoin has recovered from the market correction.