I'm not sure if this will be particularly helpful to you (I don't think it meets the criteria of the bounty). But short of jumping through Lightspark's KYC requirements the most likely candidate I could find is https://1ml.com/node/039174f846626c6053ba80f5443d0db33da384f1dde135bf7080ba1eec465019c3

It's connected to the xapo node, and has fairly large amounts of capacity for an unknown node (14 BTC, ~$421,000). Both the xapo node and this mystery node show the same location (Boardman, Oregon). Looking up the ip address ranges using Amazon's AWS IP ranges also points to them being part of the same datacenter (us-west-2), so it's likely they're both administrated together (presumably by Lightspark).

Another node that appeared around the same time (5 months ago) is this one: https://1ml.com/node/02a98e8c590a1b5602049d6b21d8f4c8861970aa310762f42eae1b2be88372e924, also in Boardman, with 12+BTC of capacity that's also linked to Xapo.