I think that reducing park rates too promptly and having park rates without continuity is very counterproductive especially if Nu is looking for new users, and I am talking about the average person here…
Thinking logically, who already owns or frequently trade cryptocurrencies is the first one who will park his/her NBT defeating the purpose of having park rates in place (we want to bring in new users - see buy pressure)
If the average Joe decides to buy some NBT and park them to earn some interest, it will take a while from the time he manages to organize his finances to get some money in the crypto world and buy some NBT. After having a positive experience (reliability of the system/ease of use etc…) we can sure count on having a new “customer” that can take in another “customer” and so on…
So cutting interest rates before the user we target has a chance to make a move is pointless.
I believe semi permanent park rates that beat or equate inflation levels in the pegged currency (at the moment USNBT) are one of the best instruments we have to attract non-speculators to use NBT.
Nu, should look, especially because of its pegged currency system, to increase adoption among the average person not just investors/speculators/crypto savvy etc… and park rates could be an excellent instrument at it.