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And I could make thousands of kinds of physical coins next monthNo, you couldn't, not without literally tons of raw material, heavy machinery and infrastructure to mint the coins, laborers to run the operation, time to process the raw materials, and a practical mechanism to circulate the coins. These are serious barriers to the creation of physical money, unlike cryptocurrency which can be instantly and effortlessly minted in unlimited quantities by a single individual and easily distributed over the internet. There is no comparison.
> A toyota isn't worth less because I can make a new car company next week
This analogy makes no sense. A Toyota is valuable because it has an inherent utility in its ability to provide its owner with an effective method of transportation, crypo-tokens (as opposed to the network itself) have no inherent utility because they are not actually a thing and do not exist independently of the ledger that qualifies their distribution. Certainly, if any single individual could generate an unlimited supply of "effective transportation" instantly at near zero cost, the value of toyota's would very quickly decline.
> Facebook isn't worth less because I could make a clone of it tomorrow
First of all, no you couldn't. You could create a much crappier version of Facebook with an unmaintainable code-base that doesn't scale and supports a minuscule fraction of Facebook's feature set, and even that would cost you time, money, and effort. Even if you could just git clone Facebook's code, you still wouldn't be able to get it running and keep it running without a team of senior dev, ops, and network engineers, plus an annual server bill in the hundreds of thousands at the absolute minimum.
> A company stock shouldn't be consitered "worthless" just because I can create a new company tomorrow...
The point is that you can't just "create a new company" tomorrow that is in any way comparable to a successful business, otherwise everyone would do it... not to say that some don't try, but the ash heap of history is littered with the remains of companies that thought they could replicate a successful company's business model only to find out that its actually not that simple.