Yahoo Mail does the same with only a 1 year threshold and regardless of how much data you use. Don't log in for 12 months = lose everything. Sadly found this out the hard way - most of my childhood email accounts were wiped :'( Now they're also disabling email forwarding for free users which I've been relying on for a decade to catch occasionally relevant emails. Might really be forced to shell out the $3.49 a month…
I still use that e-mail for online shops, etc. (a bad idea, because I also use it for Facebook, so all the online services that uploaded their customer data onto Facebook has my details courtesy of Zuck). Nowadays Yahoo's web interface keep moaning that I should turn off my ad blocker, and as my little "Fuck you, Yahoo" I keep clicking "No"..