Most dead cryptocurrencies came from projects launched during the 2020 - 2021 bull run. 7,530 cryptocurrencies from that period have died, accounting for 53.6% of all dead cryptocurrencies on CoinGecko. Over 11,000 cryptocurrencies were listed on CoinGecko during the previous bull run, with ~70% having shut down since."
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Officially, only 50% are scam and unsuccessful projects
This data shows that most of the scams, pump and dump projects are mostly coming into the market during the bull run period. It is also worth knowing that one should be on the watch out during bull run to avoid investing in such projects that won’t last and make you invest heavily in them and lose all of your money in short term. The bull run period we are heading into is a very delicate period in the crypto world where a lot of new projects are lunch to target newbies and investors who are willing to make quick profits by taking risks that are not calculated. It is important to be wary of that and take necessary precautions before investing in any project at bull run season.