Just buy the stock or buy a mutual fund which invests in IT, AI, Tech what have you. Sooner or later they will probably also be included in the general index funds.

Yes. Plenty is correct. Fidelity let's you buy SpaceX at IPO with only $2K in the bank.

And there are other reasons to be cautious. Many passive funds don't license the SP500 and instead mirror it with their own synthetic index. They are not bound to respect this decision.