Who does one complain to; is being shown on Youtube and Netflix, perhaps other channels, also secondary variant published on youtube.com/@eBayUKofficial; like 2x 1m tall 500w (?) cabinet speakers, 2x idiots, one also turning antisocial, both shouting over them in addition to nuisance music at the end; gathered message being "what a great idea!" to do that in small terraced houses, no less; from eBay: Q. Intentional misfeasance of the advertising team, or just total stupidity ?

You can complain about any advert to the ASA (The Advertising Standards Authority) who have a website and an online complaints form.

Terrible eBay advert with two males shouting over antisocial audio speakers in a small residency ? | Member To Member Support

Terrible eBay advert with two males shouting over antisocial audio speakers in a small residency ? | Member To Member Support | eBay UK