I have the original GTA VC on steam anyhow but I wouldn't share my files to the online web game myself, but in saying that if you have the original DVD copy of the game it wouldn't be bad sharing the files and you can play it on the go anywhere. Ah I think it's just a start really, shows that its actually possible to play older games now on web browsers without installing them just like running old DOS games on browsers years ago.
Yes I know that Rockstar wont be happy about it that's for sure but could you imagine if it were Nintendo games? They would be sued to oblivion
Like GTA VC is like a 700mb game in total since its like from 2003, I think we may see more games in the future added to web browsers for playing.