Why do u need email to use as a reminder – Filtrete Smart Review

I downloaded this app after I noticed an advertisement for it on some furnace filters we purchased. Once I downloaded it’s asking for several sign in options. I tried to use Apple but it tells me I need to use two factor. I don’t use two factor and I don’t care to because it was activated with one of the updates and it was too much of a hassle so I went back to my security questions. I don’t want to use Facebook or google. Too much tracking going on. Why can’t you just use an app as a reminder as it’s intended why do you need my email? I have many other apps I use that are reminders for my aquariums etc and no emails required. I’ll just use my reminder on my phone so no thanks to your app
Review by Kitkat3041 on Filtrete Smart.