In 4 months SPY has risen more than $100 with the single biggest drawdown being only $13 (which is about a 2.5 % decline). For SPY to correct 5% it would have to drop about $25. You really think that will happen? Sure it's happened in the past, but we have never had such a risk free market before.I don't look at single tickers. The thread title is "Gotta love ZERO RISK in the S&P 500". The thread was started in 2007 with the claim being "928 days since the SP500 had a one day decline of >2%". So, clearly, "risk free" markets ain't nothing new this year.
Just pointing out the flaws in your statements, i.e., no retracements, when we had multiple minor corrections last year.
As for the tech bubble comparison - I wouldn't know. But from what I've picked up NVIDIA have fairly strong earnings. Maybe those other companies you mentioned, too. With the tech bubble I believe many of the stocks did not.
And NVDA strong earnings totally justifies it being worth 2 trillion? OK sure. I don't believe it should be valued that high, but it doesn't matter what I think since it will continue to go up since it can't be stopped.