(lol so many people saying that they're an example of that) I believe it doesn't really matter if there's internet or not, it's more about how much and the way they practice ;w; You can live in the middle of Alaska in a wood shack and draw better than the people that have access to internet if you practice correctly. Otherwise, if you use what's available on the web to improve, it'll probably do a lot of good because of the variety of references and tips you can find around here ~
It depends on what you mean by "improve" many people's style have formed into reletively cookie-cutter identical styles and not very unique, and with the internet all they really learn to do is how to copy better (Including myself!) Art is not about anatomy art is not about making your style look like such and such it's about breaking boundaries where no one has gone before, the greatest artist's syles are often so unique and unlike any other in thier own special way, and they did not learn that from others, they developed it on thier own
Art is in the eye of the beholder, to most its about anatomy and you will find most art schools and careers require to you learn anatomy and color theory. Sadly you won't get very fare in a art career life without having the basics.
As for the greatest artists styles being unique and coming out of no where, that is also false, if you talk to many great artist, or even listen to a review they were in, you will see they were first inspired by someone.
art is allot of things, its just what you make of it, but most the population isn't as whimsy as thinking "it's about breaking boundaries where no one has gone before" with out having studied anatomy and other basics first.
not at all, cos im getting pretty busy with school, also i only have one computer for 4 on my house :/ i think when i get my laptop, my skills will improve a lot, dunno yet, also if i found someone to help me, would be even better