Syncthing supports transferring data via untrusted relays (used when two nodes cannot communicate directly) and also supports storing data encrypted on untrusted nodes (those nodes cannot decrypt the data)
28 karma · joined April 18, 2019
As far as I know, the quota itself isn't new, it just wasn't enforced in the past.
There are other related calculators linked also.
They forgot to remove the instruction text before replying, I guess this is the modern equivalent of the forgotten Post It note in the bedbug letter.