This is interesting to see, and reminds me that I really have no idea how to sell myself. I spent 7 years on this exact thing--a project to archive a community Slack server to a crawlable website, even with full-text search that (IMO) worked better than Slack search. I made the code available for other communities to use, and never once considered that this was a sellable product. I shut it down this year after a flurry of folks started asking to be opted out of the archive.

In case you want to run your own: https://github.com/zacstewart/tech404logs