NordVPN are far too aggressive about youtube marketing to not be sketchy imo. Open source client doesn't really help because whatever sketchy shit they're up to is probably mostly on the server side anyway. I wonder what their total youtube sponsor spot expenditure has been. It must be a ridiculous amount of money.
I don't think its sketchy, it's just that the VPN business has extremely large revenues compared to costs of the service, which means A LOT of money remains for marketing. They can spend exorbitant amounts on youtube ads and affiliate review sites. It's a bit of a unique market in this way, people are willing to pay $5-$10 per month for something that costs $1.
The fact they're in Panama suggests some kind of money laundering scheme to me at the very least.