I think that's right, that gifting is the woolly area (literally, based on all the cashmere jumpers flooding IG at the moment) This from the ASA website >
A brand sends a vlogger items for free without any control of the content (or any conditions attached) and the vlogger may or may not choose to include the item(s) in a vlog. This sort of PR activity is not covered by the CAP Code; because there is no control, the video would not need to be labelled as an advertorial.
If a vlogger accepts an item sent by a brand on the simple condition that it is reviewed (positively or negatively), without the brand exercising any control over the review, that vlog is unlikely to be covered by the CAP Code. However, in order to comply with consumer protection legislation, we understand that the CMA would expect brands and vloggers to tell consumers if an item was given on the condition that it is talked about. In general, the CMA considers that consumers need to know whether a vlogger has an incentive (financial or otherwise) to talk about a product, and if so what that incentive is.
But IMO, no commercial enterprise simply sends stuff out for free to bloggers without the expectation of something (a tag, a picture) in return. It may not be explicit, but the expectation is there.