MCIvS is funded by a National Institute for Health Research (NIHR) Doctoral Fellowship (NIHR3000156) and her research is also partially supported by the NIHR Applied Research Collaboration (ARC) North Thames. JB is funded by the NIHR ARC North Thames; she is also a salaried general practitioner at a practice that uses an online consultation platform that asks a screening question about gambling harms. MP receives funding from the SPECTRUM Consortium, which is funded by the UK Prevention Research Partnership, a consortium of UK funders (UK Research and Innovation Research Councils [Medical Research Council, Engineering and Physical Sciences Research Council, Economic and Social Research Council, and Natural Environment Research Council], charities [British Heart Foundation, Cancer Research UK, Wellcome, and The Health Foundation], and government bodies [Scottish Government Chief Scientist Office, Health and Care Research Wales, NIHR, and Public Health Agency]). RC reports personal fees from the House of Lords, the Alberta Gaming Research Institute, WHO, and the Turkish Green Crescent Society, outside of the submitted work. The views expressed here are those of the authors and not necessarily those of the funders or their staff. MM declares no competing interests.