Even as a user, you cannot do "whatever you want" with GPL software. Specifically, you can't distribute the GPL unless you also adhere to the GPL's requirements for distribution. (It's even worse for the LGPL variant, because that imposes requirements on how the software is built in the first place.)
What counts as a "distribution"? Well, that's a contract interpretation question, and if you are not asking that question of a lawyer, then you have a fool for a client. I suspect that there's actually a lot of technical GPL violations going on, but since the open source community is not litigious in general, there's little realization of those violations and even less care that those are going on.
Personally, I am not a fan of the GPL licenses for this reason. If you are trying to use legal contracts to enforce norms, it is disingenuous to argue that you don't need lawyers to be involved. Using social contracts and pressure instead would truly allow everybody to avoid lawyers and achieve much the same goals.
What counts as a "distribution"? Well, that's a contract interpretation question, and if you are not asking that question of a lawyer, then you have a fool for a client. I suspect that there's actually a lot of technical GPL violations going on, but since the open source community is not litigious in general, there's little realization of those violations and even less care that those are going on.
Personally, I am not a fan of the GPL licenses for this reason. If you are trying to use legal contracts to enforce norms, it is disingenuous to argue that you don't need lawyers to be involved. Using social contracts and pressure instead would truly allow everybody to avoid lawyers and achieve much the same goals.