I think, there's no real "mining" with these apps. They often function more like airdrop faucets or reward programs. It's tough to say if this specific app is reliable. Be cautious and do your research before investing any time or effort. Look for reviews from trusted sources and see if the app is transparent about its terms and conditions.
The OEX tokens are part of the OpenEX Network, a platform that aims to revolutionize trading protocols by offering fast, secure, and transparent trades across Core blockchains. The native token in OpenEX’s ecosystem is $OPE.
The OpenEX Network advises users to only download the APK package from their official website links and to validate the download link CID information with the APK installation package’s SHA1 checksum to ensure the package’s integrity and safety. They also recommend not using root-accessed mobile devices with their app and backing up your wallet recovery mnemonic in the settings’ backup option.
They have a total supply of 10 Billion OEX tokens. The distribution includes Community Airdrop (20%), Early Contributors (10%), Core Team (15%), OEX Foundation (25%), and Staking Rewards (30%). The tokens mined will be subjected to a one-year vesting period, in which 10% will be released upon TGE and released linearly in one year.
https://medium.com/@OpenEx_HQ/introducing-ope-and-openexs-trade-mining-campaign-228457015e17https://docs.openex.network/docs/