Legalizes online and mobile sports wagering, which currently is prohibited, for persons 21 years and older. Such wagering may be offered only by federally recognized Indian tribes and eligible businesses that contract with them. Individuals placing bets must be in California and not located on Indian lands. Imposes 10% tax on sports-wagering revenues and licensing fees. Directs tax and licensing revenues first to regulatory costs, then remainder to: 85% to homelessness programs; 15% to nonparticipating tribes. Specifies licensing, regulatory, consumer-protection, and betting-integrity standards for sports wagering.