To answer ur follow up, yeah the diff is kinda night n day but its way more tied to ur tech baseline than just the links tbh
Aged domains already got an established crawl budget n some history behind em. They can soak up pretty aggressive link velocity without setting off spam stuff cuz Google already got some trust there.
Brand new sites dont got that luxury tho. If u blast a fresh domain with a bunch of links while its running some bloated Wordpress setup or some heavy server side framework thing (which means high TTFB) Googlebot kinda sees that weird link growth mixed with bad performance. Looks off. Thats why ppl end up stuck in that 3 month lag/sandbox thing.
What I've seen is u can actually dodge that whole 3 month panic on fresh domains if u get the technical side dialed in first.
I built a new domain recently n basically stripped the server footprint down to almost nothing. Hosted straight on GitHub Pages, routed thru Cloudflare edges, pure vanilla JS with a custom DOM engine. Since it was hitting a verified 99/100 mobile Lighthouse score with flat 0ms Total Blocking Time, Google's algo seemed to trust the UX metrics right away. It skipped the sandbox thing completely, got indexed almost instantly n started picking up AI Overview impressions in a few days.
The lighter n faster the architecture is, the harder u can push a fresh site right outta the gate. Im actually running a live Journey thread rn tracking this exact serverless build n seeing what kinda value the market puts on that sandbox bypass when flipping. But yeah short version, fix the DOM stuff n load times first, new sites can handle way more heat way earlier.