I don't know if this is related to the robot discussed
almost 10 years ago [webmasterworld.com].
IP: 70.39.246.abc (PacketExchange, last time I looked)
UA: Mozilla/5.0 Moreover/5.1 (+http://www.moreover.com)
robots.txt: kinda-sorta
. . . where “kinda-sorta” means that it requests robots.txt several seconds
after requesting a single interior page (on which it gets a 403)
I find a visit in April 2016 from the identical IP, with UA
Mozilla/5.0 Moreover/5.1 (+http://www.moreover.com; webmaster@moreover.com)
No robots.txt that time; instead it asked for the same page twice. The current UA seems to go back to November 2018.