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The AI bubble produced many useful products already, many of which will remain useful even after the bubble popped.
The term bubble is mostly about how investment money flows around. Right now you can get near infinite moneys if you include the term AI in your business plan. Many of the current startups will never produce a useful product, and after the bubble has truly popped, those who haven’t will go under.
Amazon, ebay, booking and cisco survived the dotcom bubble, as they attracted paying users before the bubble ended. Things like github copilot, dalee, chat bots etc are genuinely useful products which have already attracted paying cusomers. Some of these products may end up being provided by competitors of the current providers, but someone will make long term money from these products.
Security through obscurity is a very valid way to secure something. It shouldn’t be the only way of securing something, but it can be a valid additional layer.
The knock sequence is a secret, just like a password. It may not be a particularly strong secret, but is is strong enough to keep out casual attackers. You’ll still need additional security, but sshd is well equipped to provide that.