I get a "Google Inactive Account Manager reminder" email about once a year to see if I want to update my settings. They will notify me 4 months after my last activity. After 6 months, they will set up a auto-response in Gmail, and send an email to some trusted contacts (wife, parents.) I've also chosen to give them access to all of my data in my Google account (including email.)

The nice thing about Google's version is that they already know if you're active (reading emails, searching, etc.) So it's frictionless, apart from the annual reminder to check your settings.

You can set up your inactivity settings here: https://myaccount.google.com/inactive

I think that sending an email every 2 weeks is far too frequent, and it's a really bad idea to send an emergency email after only 3 days. I think 4 months and 6 months is a far more reasonable timeframe.