I used to have a similarly priced Withings smartwatch clone; worked very well for years until I switched to a new phone and the app turned out to be gone from the store and the log in servers were offline. Without the app you can't get notifications or even sync the time and the watch is useless. Yes, well-known brands also discontinue software, but with a cheap watch like this, it's almost guaranteed to become a paperweight in a few years.

Now I have a real Withings, at 10 times the price of the fake, it honestly offers only a marginally better experience.

I will try very hard not to buy any product that requires a companion app for major functionality unless it's based on an open protocol (e.g. Matter), the app is open source (e.g. Pebble), or it's well-supported by a third-party open source solution (e.g. gadgetbridge.org).