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I've only had cheap strings of solar powered outdoor lights. One problem is that the LED leads are not well sealed, moisture gets in and the leads corrode away. Electrolysis may play a part. The solar charger/battery component also has problems with not being sealed against moisture and the battery must have a hard life with frost. They never seem to last longer than six months.
Outdoor Christmas lights are put out for a week or two and taken down and put away, so as well as probably being better made, they don't have the same exposure.
I was given a three metre strip of Govee LEDs with one side adhesive. These are 16 million colours and have a controller that does all sorts of effects. It isn't USB, it supplies 12V @ 2A. It looks as if it's strictly for indoor use. I believe they were an Amazon return. The LEDs are in six pin packages and for every few LEDs there's an eight pin package which I guess is a microcontroller which can be addressed by the control box/power supply.
The other thing that came from the same source is a White Noise machine that's supposed to get you off to sleep. That's USB powered.