Closed source? Get coins out, and uninstall. Don't support this. It goes against Bitcoin, as a movement, and as a philosophy.
i don't think people are using this wallet for "bitcoin", they use it for the very large number of altcoins that it supports which gives it an edge compared to other wallets.
otherwise if there existed any other wallet similar to Coinomi that supported this many altcoins AND were open source then i am sure nobody hesitated in switching to it.