[davismwfl]

Depends on how big the company is and how well it is lead.

Generally on my teams those who do their work and contribute to making the team, company and product more successful get promoted (when ready).

Those who hurt the team are worked with to fix the issue and only after much effort to try and correct issues is someone let go.

tl;dr - performance or lack of, and team dynamics positive or negative are what drive those decisions.