why are there no other brokers compete directly with IB?

Yep, that's the one.

 

That's easily solvable. Use IBC and a non-2FA account.

 

IB Controller has been abandoned and doesn't work properly with any newer version. The original creator of IB Controller now works on IBCAlpha.

 

To save you searching:
https://ib-insync.readthedocs.io/api.html#ibc

GAT

 

I call it via cron (not using ib_insync).

 

Me too

This is a better link then https://github.com/ib-controller/ib-controller

GAT

 

This is the current, maintained version (ib-controller is abandoned).

https://github.com/ibcalpha/ibc

 

I'll just shut up now. Not my day

GAT

 

the new broker can directly copy those IB features, even same API interface. is that hard?

 

I would say, that nowadays compliance stuff is even harder to copy than technical stuff.
In order to provide low commissions as IBKR does a broker needs to be close to the exchanges they offer, and to get direct access they need to comply to many rules and prerequisites...
Each exchange with their own around the world...