An weird invisible usage for my storage

Hey there, I really hope an expert to help me with this I would be so grateful ,

I just bought an iPhone 15 Pro Max and then after about five days i had erased/factory reset it couple of times ( for couple of reasons I can’t mention), then I realise something pretty weird that during the set up process I found that green light of camera usage was On during all the set up process, which makes me very worried and if that’s even normal for all iPhones during the set up!! and after I done the set up of my iPhone after the factory reset I found out that the stock built-in apps in Home Screen all in grey and not available to open for about 10 minutes!!! until it finally had downloaded and even besides all that I found the storage of my iPhone specifically in the >settings >General >iPhone storage> on my iPhone storage it should be only 16 kb since it’s just formatted and literally I didn’t store anything in my iPhone yet , but unexpectedly this time it was about 5 MB and this usage capacity of (in my iPhone) some times during the day it increases to reach above 8 MB is used and some times it decrease to 4,3 MB or so , and that honestly makes me terrified of it could be all of this an sign of malware stored in my phone and that could by hidden malware stored there and whenever I open (on my IPhone) it shows me that it’s empty, especially that the battery performance not last long much as it was before, please any kind of help would be more then appreciated.