Not at all. You have to respect the license of Qt (e.g. if your customer asks you for the source of the Qt libraries you have to provide them - including any mo

Not at all. You have to respect the license of Qt (e.g. if your customer asks you for the source of the Qt libraries you have to provide them - including any modification you made to them), but you can keep your own app proprietary and ship the whole however you like.