There is no reason to not just ask Claude for a review and then distill this into PR comments. Especially because "every LLM output has to be filtered through a human" is a good policy with the current state of these tools.
However, this industry loves distilling frivolities into web tools and it sells for some unfathomable reason. It is the same with the existing static analyzers etc that some orgs pay for. I do not understand why.
Those tools are better than vanilla agents by dedicating expensive human time on evaluating and fine tuning models. You can also build various integration, management and reporting features to add value. If you freeze model progress today, or 12 months ago when most of those companies started, it's a viable business I think.
But any gains you make on the first part will be lost to newer models, and the 2nd part is not as valuable when llms allow people to build fairly complicated features quickly.
I don't if worthless but all those companies have very limited time to gather customers and at least make themselves valuable for an acquisition
WinRAR is more profitable than OpenAI...
The real question is how can you compete. There are lots of answers here, but something new and good is rare.