Absolutely. Information can no longer be retrieved via internet search. Discord and Slack are effectively silos.
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.
Some chat apps like Zulip have the option to open a channel to the web. It can even be indexed by search engine bots
I know Telegram absolutely requires a mobile number, though