There are just so many reasons for the period trackers to fight any potential data requests they receive and lots of other sources of data that can provide you close enough to the same data.
I do think it is very important to specify because this is being presented as a false choice where the most important thing to do is to stop inputting data to your data into a period tracker app instead of the vast collection of all of your other data eg search and purchases. It is a false dichotomy where one of the few times people are consensually creating data is focused on instead of the vast amount of other data that most people would consider egregious to collect/collate.
I do think it is very important to specify because this is being presented as a false choice where the most important thing to do is to stop inputting data to your data into a period tracker app instead of the vast collection of all of your other data eg search and purchases. It is a false dichotomy where one of the few times people are consensually creating data is focused on instead of the vast amount of other data that most people would consider egregious to collect/collate.