Many people who want to get rich quick in the cryptocurrency space and make a lot of money in a short period of time will be tempted to invest in altcoins. But over time many altcoins become scams or disappear, or even lose all funds there. Investing in Bitcoin is a good choice when you are in the cryptocurrency market, it is more reliable and less risky. The longer you hold Bitcoin, the better your chances of reaping rewards.
Too good to be true is a signal to avoid scam, why people rush into altcoins is the belief that altcoins will make them rich over night, but year in and year out hundreds of altcoins keep pumping up but yet investors, keep getting poor and huge money are getting stolen away from the cryptocurrency market cap.
If you check the record of loses in the the last couple of years you will be amazed how much investors have lost on altcoins.
So ops are right to stay away from altcoin.