Do you have a source for this? As another poster replied, I was encouraged to report symptoms and given a packet with information on what to look out for, what to report and a website to do so.
Same with my wife and two adult children.
So I can't speak to the quality of any websites. But I do not recall anyone before the parent comment saying they were actively discouraged by health workers to not report symptoms.
Apparently this phenomenon is known for actual covid sufferers.
https://wexnermedical.osu.edu/blog/why-are-people-developing...
https://www.npr.org/sections/health-shots/2021/02/19/9691430...
“According to Pfizer-BioNTech and Moderna, interim analyses after approximately 2 months of follow-up suggest their vaccines are 90% to 95% effective at preventing SARS-CoV-2 infection, although no peer review of the data has been conducted to date. Both companies now claim they have an “ethical obligation” to offer vaccine as soon as possible to all participants who received placebo, considering the strong results and participants’ contribution to the research.“
There are somewhat more exotic studies designs that can be used for post-unblinding monitoring work that meet the ethical obligations to the participants.
But it's a good question.
Put another way: Isn’t VAERS a necessary solution to ensure that the healthcare system does not misrepresent the safety of the vaccines? Transparency should be a first principle requirement for science.