Yes. It can. ISPs are throttling speeds for certain connections. When I use my VPN, I get dramatically faster streaming speeds. Not faster than my maximum Internet speed. But, definitely faster than my regular connection. ISPs discriminate based on the content and websites you connect to, no matter if they say they are not. I don't have very fast Internet (34 Mbps). But when I Netflix on my regular connection, I get 1.5 MB/s. When I do the same thing through my VPN, I get 3 MB/s. Same TV show, same content.
So the least a VPN can do is make sure your ISP won't know what you connect to and because they don't know they cannot throttle you. But, can you go above your own max Internet bandwidth? No.
