Because OP is trying to promote his project and get feedback, and you post about a competing product, to me the message is: don't look at the project OP wants you to check out, I've been using this instead and and it's amazing!
Who cares what you're using, I see show HN posts to be about OP's project, seems like a dick move to me to diverge attention to some other project. I just don't understand the motivation
I never read such comments in that way, the way I read them is actually like feedback to OP around benchmarking against competition.
Personally I love knowing about my competition, and it helps me with how I can differentiate and win over certain niches.
I don't know about OP, but I'm never offended by that, always grateful, helps me craft my message and delivery to the right audience and map out strategy.
I try not to over read into the open internet motivation behind end users, they may become customers, so I rather welcome them and seek to understand rather than judge.
It could help people. It's possible the sigabrt didn't even care to Google about Healthchecks.io before I decided to vibe code his own.
Also, what do you really think the odds are that sigabrt.dev will still exist in 2 years from now? Or 5?
The first thing I always want to know is, what does OP's project offer over pre-existing mature ones? Especially important when I'm seeing an increasing amount of projects that don't seem to even bother considering pre-existing projects.