Well that's the problem. There are a lot of low-quality, defective LED bulbs being sold. Consumers don't have an easy way to find good ones. Just paying more or looking for a trusted brand name is no guarantee of quality.
This is true of all consumer products, not LEDs specifically. LED lighting has been mainstream long enough now that you can find plenty of information on which specific brands and models are decent.
My personal anecdote is that I have yet to have any Philips LED bulbs die on me. The oldest ones I have are from 2012.