Pretty normal at all the big tech companies.

When I worked at eBay I changed desks more than once a year.

At Netflix it was really abnormal that I sat in the same place for three years. That was largely due to the fact that a special area was built for the SREs with an area for guests to hot desk during incidents and we didn't want to rebuild that.

Pretty much everyone else that reported to my Director moved away before we finally had to move buildings.

Unfortunately pretty common.

Any insight into why? I didn't know about this. (Haven't changed my desk ever while working somewhere)

I've moved desks 6 times (between 2 buildings and 5 floors) in under 3 years. I guess when a company is growing rapidly, you've got to shuffle people around.

Teams grow at different rates and get bin-packed into mostly adjoining desks.

It is due to Brownian motion.

https://en.wikipedia.org/wiki/Brownian_motion

I worked at Microsoft for 12 years and I probably moved desks 20+ times. A handful of those was because I changed teams, but even in the same team, you do tend to have one or more office moves a year. Team focuses change and often people are re-grouped as a result. Other times you just run out of space in a building and they move your team to where there's more room (because maybe another team was disbanded or moved somewhere more suitable to their size).