Anti-gambling campaigners have called UK bookies William Hill reckless and greedy for promoting their new in-play betting app despite concerns over the app’s legality, but Hills isn’t bothered.

This spring, William Hill Australia rolled out its Click To Call smartphone app, which relies on voice recognition technology to circumvent the country’s longstanding prohibition of online in-play sports betting. Me-too apps from local rivals Ladbrokes and Bet365 followed shortly thereafter, but these technological workarounds quickly caught the eye of regulators.

In July, the Australian Communications and Media Authority (ACMA) confirmed that it had written to the three bookies to express the ACMA’s skepticism of the apps’ legality. The Australian Federal Police (AFP) launched an investigation of the apps and enlisted global cops Interpol to help their investigation based on the fact that some Aussie betting divisions’ servers are hosted outside the country.

Ladbrokes has mothballed its app until legal clarity emerges, but Hills and Bet365 continue to offer their respective services. A Hills spokesman told The Australian that the company remains “confident with the legality of the service and have obtained senior counsel advice to confirm this.”