Whether CTB is "brave" or "cowardly" is heavily based on the circumstances the CTB was executed in as well as the individual catching the bus. Overall, CTB is neither; it simply is. We just assign our own interpretations of things onto the action
For instance, there are cases where abhorrent criminals take their lives before they are to be judged in order to escape the consequences of their actions. People would argue that's cowardly because one is ensuring that they won't ever live to experience the full scope of the punishment they deserve. However, for a terminally ill patient, taking one's life might be seen as an act of bravery since they're facing their inevitable conclusion head on. A pretty bland answer all things considered, but that's generally how I view it
Personally, in the context of this server, I think CTB is an act of bravery—though mental fortitude feels like a more apt term to describe it. There are already tales of SI ruining everything, sometimes to potentially devastating results, so one has to truly come to terms with their end and what they're doing to themself. And that's only preparing yourself mentally. The several amount of posts on the SN, Night-Night, etc. megathreads are proof enough that governing bodies have excelled at going out of their way to remove any way out
If you want to go out using SN, good luck trying to find a supplier, and even then, there's still a possibility that you'll get welfare checked by the police. Unless you have proof that you're a hardcore enthusiast of curing meat, the odds of you being seen as someone who needs to be sent to a ward are huge since CTB via SN is a common thing. As for the night night method, while easy, it's efficacy is dubious. Checking the most recent posts give that away easily, and it was put into even more questioning when someone sent a wpd vid of a dude allegedly going out this way and taking ~7 minutes to go out. (Theoretically, you're supposed to be out by half a minute at most.)
All this to say, to see this seemingly unsurmountable challenge and still attempt to CTB regardless, that takes a lot of bravery