How do you account for stock/option appreciation? Which number is displayed on the site? There might be a huge difference between a person reporting their total compensation from their offer letter (according to the fair market value at the time) vs what it is after a few years of appreciation.
We think of data points on our platform as snapshots of salaries in time. Currently, we ask for the last reported year of compensation which would include stock appreciation. You can distinguish this on our compensation page by filtering the "Years at Company" field: https://levels.fyi/comp.html?showFilters When the Years at Company field is 0 it is a new offer.
if you want to educate people and also raise awareness, you get a lot of pushback from people that do not believe anyone is making these amounts, people will literally debate the point because they are barely making $90k, and then your site comes along and the only source I can give shows people making $500k but really their compensation package would have said $320k annually. These are unnecessary hairs to split with an audience that understands none of it. They wouldn't believe the $320k or the reported $500k.
I think your site should either choose one standard, or add further metadata to what compensation people are getting/reporting. A scatterplot or graph that showed offer vs annual compensation would help. Reaching back out to people that uploaded offers to upload their tax document would help.