If you look around, you'll find a very little number of people who had a crack in their frame.
As usual in forums, you will only find people presenting their new bike, or complaining when something goes wrong.
Nobody takes time to say, "hey, today my bike is two years old, and everything goes well"
I've built quite a few bikes for friends and family and there isn't any problem to report.
Except learning mistakes I did when mounting them.
On the opposite side, since I started about 5-6 years ago, I did break 3 frames.
Always in a crash, a 256 falling with all my weight on a seat stay.
A first 041, falling on the side, and breaking the seat tube at a junction ( a clear design issue, the frame is not sold anymore ).
I got it warranty replaced, and after about 3-4 years I did break it again, in a harder crash, but at the same seat tube junction.
And before thinking, direct frames from China are bad.
A did break two Canyon Ultimate frames too( without crashing )
Once the seat tube/derailleur junction and once a seat stay.
In the meantime, some friends did brake Scott, Trek, and Cannondale frames.
The only frame I could not break so far is my gravel Carbonda CFR505 that endured quite hard rides and crashes perfectly.
A reason I stick to them for now for all my new builds.
EDIT: Sorry, I forgot my current MTB a Workswell 062, that is now replacing my 041 while waiting for a brand new FM936.
A friend, who destroys everything, borrowed it, but didn't succeed to break it either during about 2 years of hard riding.