this honor rule to drop a series when it gets an official TL makes no sense to me. Never did.
Well, in ye olden tymes, fan translations were not considered a paying job or a way to stick it to the man. They were seen as a necessary evil, making an english version available where otherwise none would exist.
That attitude has largely fallen by the wayside these days as the fandom has gotten larger and more casual. Many folks are now "Please subscribe to our Patreon so we can afford to buy comics and pay translators!" or "Screw anyone with the audacity to try and do this legally, pirates are awesome!", and the "fan" part is a token afterthought. But a few still honor the old ways.
This is not to say legal releases are always good. There are times that the fans need to step in simply to fix horrors wrought. I can think of a few near to my heart that were horribly butchered through incompetence, if not outright malice. But for the oldschool, the preference is still for the fan translations to step back once a legal one is available and see what happens.
Yes, I'm old.