The only problem with this app is that when you design your Home Network and Smart Home securely, you would have 2 isolated vlans for your IoT devices including Homey and your regular clients.
IoT devices are not always updated regularly, and this leaves your network vulnerable to hackers. Especially when you have a lot of (matter over )WIFI devices.
I would not advise people to give Homey the rights to scan for active client devices on the network. Instead, I once wrote this tutorial on how I implemented presence in my Homey. It has been working pretty reliably for me.
