Alphabet Inc. (GOOG) is confronting a fresh antitrust lawsuit, with rival app store Aptoide S.A. accusing the company of maintaining a monopoly in the Android app distribution and billing system sector.

Aptoide claims that Google leverages its market power to stifle competition by making it more difficult for developers to access its Google Play ecosystem. The company asserts that Google's "restrictive practices" prevent it from offering better pricing and services to consumers.

The lawsuit has been filed in a U.S. federal court, seeking damages and a court order to compel Google to cease the alleged conduct. Aptoide also cited several issues, including an inability to access critical applications and developer resources, which it argues significantly hinder its competitive position.

This legal challenge adds to the array of regulatory difficulties facing Google. Previously, courts have already ruled that the company violated antitrust laws due to its dominance in search and its app store policies, leading to mandates for restructuring parts of its operations.

For investors, this development underscores the persistent regulatory risks confronting major technology firms. A key question now is whether mounting legal pressures will prompt further changes to Google's app ecosystem or impact its revenue model.