[withdavidli]

One big reason: turnover rate. For recruiters it's about 70% first year, and ~90% by second year. Most jobs are contract and not many people survive agencies. Internal jobs are more stable so turnover rates are likely a lot lower.

There are people that stay in contact throughout multiple switches, but it's pretty rare. Staying in touch after getting you multiple jobs presumes they are likely in agency and that they still work on the same type of roles. Agency turnover is high so they might not even be in recruiting after the first year. Then also take myself, I worked on varying roles from finance, healthcare, mech eng, swe, ml, pm, and more all in the last 2 years. Chances of me working the exact type of role I got you into a year later is unlikely.