That said, the last two Anker power pack models I've bought were both recalled for sometimes exploding/melting down in use. Once I'll give them, but twice? In a row?
You could also count recalls as a higher quality signal: QA, people testing, how they handle the recall & replacement, etc. Way better than not hearing anything because nobody's looking. I'm skeptical Anker is doing crazy-unique things with their manufacturing, vs. an OEM manufacturer cutting corners to save pennies.
A lot of big manufacturers have had recalls (for things like laptop batteries, vehicle batteries, the infamous Hoverboards, etc) so I wonder what Anker's batting average is compared to others. It's clearly a hard problem and squeezing in the level of density that customers expect means potentially thinner safety margins.
One of mine bought in 2017 was recalled and replaced, which impressed me: how many of the word salad brands of today would even be around to handle a recall if their devices decide to spontaneously combust?