a profitable company you're buying a share of and for a cheap price.
A company in which the owner receives nothing from the business operation is not a "profitable" company. Where the shareholders do not receive dividends, and have zero expectation of ever receiving dividends, the business operations of the company are divorced from the value of the share. From the perspective of the shareholder, there are no profits to consider.
The actual "fundamentals" of such a share is nothing more than the faith that someone else will want to buy that share for more in the future, and the only reason that second person has to buy it in the future is the belief that a third person will buy it later.
That is exactly the same "fundamentals" as crypto; the same "fundamentals" as a ponzi scheme.