Splash protected, but not waterproof. You cant dive with it. But you can use it when it rains.
Check out the quality of this video with the gimbal and the Feiyutech G5.
Competition for mobiles phones:
Zhiyun Smooth-Q 3-Axis Smartphones (best budget choice)
You can use a GoPro 5 or 6 on these but you need to use big rubble to balance (or something similar). There are also balance plates you can get.
The DJI Osmo Mobile 2
From Kjell & Co.
https://www.kjell.com/se/sortiment/mobilt/gadgets/selfie-stick
Heat the 3/4 " over a fire or something hot for a couple of seconds so you can get the
skateboard bearing into it and get a nice fit.
BE CAREFUL HEATING PVC PIPE! IF IT BURNS IT IS HIGHLY TOXIC
Drill 1/4 hole into, make sure not to drill into the skateboard bearing.
Next, drill 1/4 inch holes into the coupling ring and also 5/16 holes (bigger) goeing through each side.
Then drill 5/16 holes into the 2" pipe, 3 holes for an optional handle.
Aluminium bar and bend it by hand or other light material. Drill 5/16 inch holes in either sides. And one in the middle
Next thread in some 1/4 bolts into the 3/4 inch and put nuts on eather sides.
Finally add som 5/16 bolts through the 2 " pvc pipe. Add on an optional handle if you
choose to.