Thats pretty much rugpulling if they do ever consider returning, which is the main problem here. The other problem is if you instate such a policy where inactives can be fully looted (items today, networth tomorrow), it's also a bit predatory/FOMO on the playerbase (i.e. the devs effectively saying "if you quit, when you return you're starting your cash from scratch, you better not quit").
If you ever do quit or take a long-term hiatus it's actually better to keep your networth in items which grow with any economy inflation. Raw money can be subject to inflation so you shouldn't sell all your items and put into stock market or vault or whatever. (Only exception being is if you hold items that become powercrept, which would be more than the inflation)
You're also looking at farming the big dogs, who probably have a higher chance of returning at some point (compared to noobs - they will quit and absolutely never return).
Someone mentioned rare collectibles, well, if they ever do return... they're gonna hate to see that stuff gone.