PM sent about the use of firmware.
You are never required to mention PedalPCB in your builds. There are two guidelines:
1) You do not build fakes/counterfeits (eg: pass them off as originals or use trademarked designs/logos/names)
2) You make it clear that the builds are your builds and all technical support is offered by you, not PedalPCB
I have no issues with you covering up / removing the PedalPCB logo on the PCBs, however this does not imply permission to duplicate the PCB layout for your own use (commercial or not).
Custom branded boards are a possibility, but there are minimum quantity requirements.