Bitcoin exists only in electronic impulses. When the owner of the website and the software decides to cash it all in, and dismantle the website, you are left holding your keyboard.
There will be no trace of Bitcoin. No use going to Google’s cache. No owner to track down and sue. Your “money” will have vanished, and there is no insurance. No monthly statements in the mail. No 1099s to the IRS. Gone.
Bitcoin isn't a website. It's a distributed ledger that cannot be turned off or shut down.