PIA is just one of the Kape brands. Nord Security owns the Nord, Surfshark and a bunch of others.

What does that have to do with pricing competition? Clearly VPNs do compete on price, just the low cost brands aren't blowing money on ad spend.

Or maybe just different marketing strategy eg Nord costs more to begin with, and then they use "promo" deals with offer huge discounts resulting in a normal price again.