I have seen lots of PSAs to stop using period tracker apps, because most of them sell data to brokers and that data could be used to find or prosecute people who have abortions. That's very good advice!
I would add, however, that if you don't have periods now would be a great time to download a period tracker and start tracking all the periods you aren't having.
Not everyone is going to leave these apps. Maybe they think it won't be that bad, maybe they think it won't affect them, maybe they just won't get the message in time. It doesn't matter. They still don't "deserve" to have their data weaponized against them, and polluting the overall data set is one way to make that harder.
We know what the danger is, and we're taking steps to protect ourselves. Now let's go one step further and protect everyone.