I heard that Google Play Store has reinstated MetaMask and it is now available again.
To avoid issues with Google Play (and Apple) not approving crypto wallets and dapps, developers should consider providing a web based wallet and web3 browser for dapps which can be accessed from any device with an Internet connection without having to download anything to their device.
Or the users could simply download app from the developers' official website becase mobile browser currently lacking extension to install wallet and the only other way other than using app in mobile is through using exchange.
Google have some reason for not approving metamask and it's more likely that they are concerned about the security of that apps or maybe the developers is taking it down themselves.