Only way to get rid of this suspicion is hosting LN server on our own. Any app can have backdoors. Bitcoin teached us to trust no one and be your own bank. Maybe we can't completely switch to self hosted wallets but at least everybody can store big chunk of Bitcoin in their cold wallet/paper wallet and use LN wallets as a tipping/daily using money source. For me, 50$ is enough portion to keep in LN wallet.