All the FAANGs do, though it sometimes varies. A year is typical though (and I think at different times in their hiring cycle it varies, too).

For one FAANG, I had 3/5s my interview panel all clearly very positive about me, and 2/5s who clearly did not care from the very first minute of the interview, and the internal recruiter was like "Let's talk again in a year". Like, the implication clearly being he expected a pass, it was just luck of the draw on the panel. But even with that, year 'cooling off' period.

Potentially. The person who replied to you before me said it’s standard, but I remember reading online somewhere at the time that 6 months was the cool off period.