Nothing new, nothing sinister, it's to protect you.
Nothing unusual in that as they are following a law that is there to protect you and your money and has been in existence for as long as I've known it.
Way back in 1962, when I first started working in a bank, one of my first jobs was to check for any savings account that was dormant and see if we had any contact from such customer. If not it was transferred to the government who from that point on acts as trustee and for the funds and will return the funds when claimed by the legal owner.
Also applies, not only to banks but, to everyone that holds unclaimed moneys. The government has a website listing all these moneys, I think that now it's administered by the ATO, and claiming the money is easy.
Peter.