There's two flavors of the chip shortage problem:

1. TSMC leading-edge process is the hottest (coolest, really ;) process and just not enough capacity to meet all the demand for mobile, high end desktop, GPUs, etc. This predates the main shortage we're talking about. Cryptocurrency mining is a contributor to this one, too.

2. There's a broad shortage of parts made on less cutting-edge processes. Causes: disruption to production from COVID, disruption from automakers churning orders, increased demand for consumer products, and speculation/hoarding.

Of course, #2 made #1 even worse.

For AMD its also that zen3, RDNA2 and the new PlayStation and Xbox consoles all launched at the end of last year and are all competing for the same wafers.