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Well, there are plenty of open solutions that you can self host.
Personally, i find Rocket.Chat ( https://rocket.chat/ ) to be simple enough to set up in a Docker container and have running as a passable alternative to Slack/Discord. There are downloadable clients as well. The only real downside I've seen is somewhat bad support for calls because their WebRTC implementation is still new and integrating with Big blue button or whatever else they offered is hard.
I lead the Zulip project.
I'm not sure about this detail of Slack's ToS. At a technical level, you can certainly export your data from a Slack (which is we implement https://zulip.com/help/import-from-slack); I imagine it's easy to write a tool to format and publish it.
FWIW Zulip maintains https://github.com/zulip/zulip-archive, which is a configurable API-based tool for creating a static HTML archive from a Zulip organization, with tooling to update it every few minutes. A lot of larger open projects use it. (We're also working on a native logged-out access feature with less janky formatting, which has a working PR that we need to integrate).
I suppose you could export your data from Slack, import it into Zulip, and then publish that using zulip-archive if you didn't want to write any code, but I'm sure the formatting would be better preserved if one avoided the "convert Slack markup to Zulip markup" step.
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