If I feel the review and the community itself is hostile like Royal Road, I will just take it off and post it somewhere else.
I write for a peace of mind and to share the fun, even if my subject maybe controversial for some, I just really love writing it.
When heated drama gets in the mix, I have no qualms to stop posting my story entirely,
That's why the most important thing is to find a community that works for me.
The second kind is, when is how the review is negative but the criticism is constructive, I will just take what works for me.
As for restarting from the beginning? I treat it as a personal journey and it's often surreal and doesn't make sense. I tried my best to make it, so no matter how screwed up the story, I will still able to continue given I have the motivation. No need to care about the specifics and write my heart out.
Even if I wanted to restart it, I'd rather just try to write it 'til it was finished. I don't just write for the story alone, but to experience the moment.
For abandoning, that's a different matter. Sometimes things cannot be perfect for me the entire time. I will lose my passion on certain things and ideas, especially after a long time passes.
If I'm considerate, I'll consider giving it a premature ending, but if I feel no one cares about my work, I can just delete it.
Does the negative review matter? It's more about the community in general.
If it's the top review, it can be a representative of their stance. While the gap between the second or third exist, it's only a part to determining the community's nature. Might be on the comments, the forums, or their discord. The staff member's reaction, the rules and guidelines, etc...
Like I said before, if I feel that I'm hated and unwelcome, I'd just go. I don't want to make any more enemies, if I couldn't instantly remove them for intruding on my life. Things like hackers and doxxers had always scared me.
I don't like friends that doesn't respect my time as well.
So yeah, being alone is cool, I guess. A quiet community where it feels I'm in control of my own work--it fits me best.
My experience told me, that before I posted my writing in a new site, I need to thoroughly research it. Though I'm lazy and don't really care much about publicity, that's why I'm cozy at that one site right now.