.... internet speed suddenly degraded because whole world was trading and jammed the internet ....
In 1987 there was an internet of sorts, with very limited resources, mostly for universities and military.
I believe CompuServe was the first U.S. company that gave the general public access to the internet, and
that was in 1989. So I have to make a declaration of shenanigans.
To access my broker I had a telephone dial up modem at 14.4k {WRONG SEE EDIT} . I dialed a telephone number that was for my broker's service and was able to connect to limited access data. They operated what amounted to a BBS or bulletin board service, that was the extent of online services then. I could not trade that way only get limited data. I still had to make a telephone call and speak with a human to get an order placed.
There were BBS's for all sorts of topics and you dialed into them. Some had fees, some were free, and of course long distance telephone charges applied.
The backbone of the internet at that time was 56.6k nothing close to the gigabit service a home user has today.
As far as learning anything. Nope, no good story. I was just a dumb deer in the headlights. I learned that bad things happen with no warning, they are fast, and with massive effect, find ways to protect myself for that. A good lesson to learn, but not a good story.
EDIT: I must have had a 1200bps modem in 1987 not 14.4k. My memory of technical spec's from 30 years ago is not the best. But I do remember whether or not I had internet.
EDIT #2: a clip from 1983 movie War Games - audio coupler for connecting a computer to a modem.