Many typical viruses have spike proteins, that's how they're able to infect us in the first place. But with the vaccine, there were multiple instances of people on live tv experiencing "cytokine storms" from the intense immune response that the vaccine gave. Some people literally fell over and passed out within seconds. This is the kind of stuff that causes heart and other organ damage.
I'm not sure if you saw this, but autopsies were done on multiple people who died (all had gotten the vaccine), and in all of them, they found long stringy alien fibrous tissue in their hearts and other parts of their body. This was never a thing before covid; the medical examiners never saw this before in their careers, and this was not found in bodies that never got the vaccine.

> It's more similar to Dengue fever and HIV.
This website says that covid and the flu are basically the same in every way, with minor differences like an extra 1-2 days of having the virus before showing symptoms, and covid spreading faster than the flu:
https://www.cdc.gov/flu/symptoms/flu-vs-covid19.htm