I've used Codeberg for some projects and while their work and services are impressive and their progress steady and good, it's really not a proper alternative to Github for many use-cases.

"It depends", as always, but codeberg lacks features (that your use-case may not need, or may require), uptime/performance (that may be crucial or inconsequential to your use-case), familiarity (that may deter devs), integration (that may be time-consuming to build yourself or be unnessecary for your case) etc etc.