I have used SanDisk cards for years, without issue. They are a huge manufacturer of flash memory, which is why their prices were always good. It is certainly possible and even probable that the quality has gone down. All kinds of companies lower their product’s quality and reliability to make them cheaper to increase profits.
Yup. Global Warming is literally burning and flooding people to death, but political leaders and citizens are focussed on UFOs and aliens. Where are the hearings on how the oil industry knew this was happening and covered it up? If you are looking for a conspiracy to hide something huge from the world, that would be a good place to start.