Big companies like Swiggy and Zepto will mine the F out of your data. Some of it is for their benefit but some of it they could sell in the future. These so called founders are really just another wolf of app street looking to pump and dump. So when they do dump, or when some VC comes with money, they don’t just sell their app they sell it as a whole package of data and analytics that some company can use to sell their product or something VC can leverage to sell their stock to someone else. It’s not that difficult.
As far as smaller apps go these apps outsource their development to people who come with ‘packages’ to develop and maintain their app. These packages are the same logic as above but it’s just that they come from some template so you might be asked for location permission or camera or microphone by some really random app that has nothing to do with it.
While the quality of iOS is degrading, some of these things are really important and simply work better on iOS.