I wouldn't blame IKEA specifically, any chipboard furniture would be prone to this.
They sell lots of both. If you're buying a $10 coffee table, yes, it's going to be particle board.
I feel like people are missing the core of ikea: it's well priced, stylish furniture that you can move into your condo or apartment easily.
So some IKEA stuff is well priced, some isn't. Some is great value for the money, some definitely isn't. Some styles are plain ugly as fk to us, some they nail pretty well for the price. I think its called hit-and-miss situation.
Their kitchens are great value generally - not top notch by any means, but at given price even professionals tend to agree they are the best. If you want something better, prepare 2-3x the price. And since you never move kitchen, most complains mentioned before don't apply.
Almost all of it is MDF, not chipboard/particleboard.
Perhaps the epitome of Ikea's engineered lumber prowess is either their Kalax line or their Lack tables, which are built from fiberboard blocks held together by a plywood diaphragm and with a celular cardboard core.
That was the 4th move, where I had disassembled and reassembled it each time. One of those moves was across the country too.