I think I now found the bug.
With the "putty at full width" log you have posted now, I see following:
Mar 11 17:22:30 raspberrypi rbfeeder[743]: [2021-03-11 17:22:30] Network-mode disabled. Using local dongle.
Also in your file /etc/rbfeeder.ini I see following:
[client]
network_mode=True
The cause of failure is that you have written "true" with capital letter T instead of small letter "t".
To fix it do following:
sudo nano /etc/rbfeeder.ini
In "True", change "T" by "t" like below,
[client]
network_mode=true
Save file (Ctrl+O) and close it (Ctrl+X)
Restart rbfeeder, and then check status
sudo systemctl restart rbfeeder
sudo systemctl status rbfeeder
.