There are a couple I have in mind. Like many techies, I am a huge fan of RSS for content distribution and XMPP for federated communication.
The really niche one I like is S-expressions as a data format and configuration in place of json, yaml, toml, etc.
I am a big fan of Plaintext formats, although I wish markdown had a few more features like tables.
Don’t worry, in 5 or 10 years Google will develop an alternative and the rest of FAANG will back it. It will be super technically correct but will include a cryptographic signature that only big tech companies can issue.