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I dont think you understand how this works. At all. The long term value of any asset depends on the amount of value it generates for an economy/society. Despite the fact that there might be short term corrections, coins can have a general uptrend over the long term.
The upside is very much infinite, while the downside is limited to 0.

agree, however right now, all CCs are following bitcoin until such time they decoupled from bitcoin for the reasons you mentioned.