I actually got a major raise after 6m, and then another major raise 1y into my career, because my boss recognized my value.
Sadly this is not as common as it should be - but I've also mentored folks at FAANGs who got promoted after 1y at the new-hire level because they were so clearly excelling. The first promotion is usually not very hard to attain if you're in the top quartile.
"Winner take all" environment