if someone says bitcoin is a scam, maybe people who say bitcoin is a scam, maybe they don't understand bitcoin, or maybe they are people who feel rivaled by the presence of bitcoin, because for me there is no reason to say bitcoin is a scam, because I know, if bitcoin is a scam, it's certain that bitcoin won't last long, and people definitely don't want to invest in bitcoin. But the proof is that bitcoin has been here for more than 11 years, and over time, many people have jumped into bitcoin, even the government. have adopted bitcoin..
If we are to assume that bitcoin is a scam (which it is not), we wont still be able to know when it is going to end. Why? Because, you are not one of the scammers that owns it, they are the ones who would decide when they are to stop. If you have read about all these Ponzi scheme and the rest of them types of scams, you will come to know that some of those scams had to even run for years before people realized that they were scam.
And people only came to realize that, because the owners were not able to keep it going for long and then they get caught. So you cant tell when its going to crash. But bitcoin is not a scam and it will never be.