Always check everything three times and remember that claiming Bitcoins from an old wallet can be a real threat to your security.
Always remove the coins to another wallet before planning to use your private key to scrap all these shit coins. I had no idea about these coins in the market and the main reason for these kind of forks is because once upon a team they can say to their grand kids that they owned a crypto that forked from the main
BTCitcoin and to have a feel good session during old age, other than that i have no idea why we need a million coins

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You're essentially asking why there are so many altcoins and I think that answer really comes down from ambition. They see a small tiny minute possibly for improvement in a certain sector and believe they could capture 100% of this Industry use in their coin. We see it constantly and they fantasize and dream big but what ends up happening is a speculation, manipulation and dumping of a majority of these.