I have not tried them as I have converted all of my WiFi switches to Tasmota or Espurna and off the cloud.
In the beginning of using WiFi switches (SonOff) I did try the cloud apps and typically when first booting them up and connecting them to the cloud the cloud apps did update the firmware to the devices. It was always a hit or miss and multiple attempts to update.
Off the main topic....
I personally am not tethered and have never been tethered to my cell phones or any social media and not dependant on any cloud apps for my day to day activities.
That is me.
In the last few years only access my security, automation, CCTV via VPN clients to my VPN server. (L2TP/IPSEC and OpenVPN).