The Shulchan Aruch if I am not mistaken says to make yourself a rabbi (as opposed to picking leniencies from here and there) and I don’t recall it saying imposing anyone’s opinions, even legitimate opinions, upon others. Much less does it suggest R”L to despise those who hold different than your hypotetical rabbi (aka Rabbi Google) and mock them as “frummer than”.
I checked with OU. They don’t consider regular US salt pesahdig, because the iodization process involves corn, they don’t advise it and certainly don’t certify it. They told me it’s really kitniyot and not chometz gamur, but obviously, Askhenazim don’t eat kitniyot and most include corn among kitniyot. Pure sea salt is obviously acceptable for Pesach, but in the US is mainly available as the coarser “kosher salt”, of course one can buy finely ground sea salt (non-iodized), but one has to be aware of the issue and to look for non-iodized salt.
Some sorts of sugar may also have corn starch or traces of it.
If you eat corn, enjoy. But many people don’t, and don’t eat corn derivatives. If you think you are qualified to pasken for yourself, it is none of my business, but please don’t try to be “helpful” with leniencies which are not necessarily acceptable. Our rabbis are perfectly capable of telling us leniencies and they don’t enjoy making us miserable for Passover, as you seem to insinuate. Shops also are there to make a living as well as to offer us products that lighten our workload and that allow us to enjoy a variety of foods. If you think that checking quinoa – for those who eat it – is easy and fun, it is obvious you do not know how to check it properly, it is obvious you are assuming that you only have to check for wheat kernels, please ask your Sefaradi grandmother to check for you a handful of quinoa, and watch her. Besides, your comments on price-gouging do not deserve a reply.
It is also interesting you rely on the OU when you find it convenient, but then you appear to be following Sefaradi minhag, and as I am sure you know, Sefaradim can not rely on the OU, as there are OU certified products which are not acceptable for Sefaradim. Please check with your Sefaradi posek and/or with OU themselves.