A lot of sites now block non-Google search engines from accessing their data.

Honestly, I find it easier to check a Discord server than to get useful results from DuckDuckGo these days.

Google has done whatever it takes to incentivize people not to use competitors. It sucks.

Same thing can be said about Twitter and most of Facebook

For now at least. Some day everyone's relatives will be digging through databases of their ancestor's grand wisdom filleted wide open. Maybe it'll even use all that info to recreate an Ai version of them. Sorry just thinking out loud.

That sounds awful. But there's no reason why Discord can't go the same route.

Some chat apps like Zulip have the option to open a channel to the web. It can even be indexed by search engine bots

Sure but you can search for communities then use the platform-native search. Not as convenient as a search engine natively supporting, though.

you have to have an account, with mobile number

Are you sure? I seem to remember Discord requiring an email but not mobile number

I know Telegram absolutely requires a mobile number, though

It will sometimes let you register without a phone number, but other times it will demand one. I imagine it has to do with IP reputation and how many accounts have been created from your network recently.

until the discord server goes down

If the thing goes down there's no guarantee any indexer/scraper is going to index/scrape it