I saw my iPad was active yesterday on my Gmail device list, but I haven't used it in a while.
I only have two sessions on my Gmail account: my iPhone and my iPad. I haven't used my iPad in any Google apps in a long time, but somehow, it says on my device list that it was used yesterday. I looked at my Gmail recent security activity, and there's nothing. I don't download cracked games, I don't click on links, my passwords are complicated, and I have 2FA on everything. I don't use the mail or calendar app.