Out of all the scam projects you mentioned, I was most impressed with bitconnect, it was a very successful ponzi project in 2017 and its price has increased to over $400 per token. But in the end, what comes must come because it is just a Ponzi scheme.
It was the demise of Bitconnect that was the leading cause of the 2018 bear season, a catastrophic bear season no different from this year.
I believe you forgot the real biggest scam history in cryptocurrency which is the Mt.Gox considering that the hacking event is an inside job since the CEO is jailed for falsifying there records. The estimated amount loss on this event was around 650K to 800K Bitcoins which is a trillion or billion dollar value using the current rate of Bitcoin.
Lots of undocumented exit scam too happened that greater value on the NFT industry during its hype.
The bitcoin price in 2014 was not as high as it is now, so it cannot be said that Mt.gox was the biggest scam in crypto history. For comparison, I still rate the crash of FTX as the biggest market crash ever, wiping out $120 billion in market capitalization by the time it collapsed.