This is exactly the wrong thing for a 20yr old to do with 100k. (Assuming they have no other assets)
When I was 20 I needed a reliable car (having an unreliable car subjected me to periodic unplanned multi thousand dollar shocks), buying books for school (individual stem textbooks cost a couple hundred bucks)
Yes I should have started an investment account but given my other finances I should have been putting in modest amounts every month, but frankly when daily life is costing more than you make it doesn’t make sense to earn 8% while incurring debt that costs 15%.
I’d say the trick is stability. The uncertainties of young life with no money cause things to cost more than they should.
If my children had a $100K windfall this is precisely what I would tell them to do assuming they had an emergency fund and no debt. If not, I would tell them to create an emergency fund, pay off reasonable debt, and then to invest the rest for 40 years.
Read and internalize https://www.bogleheads.org/wiki/Prioritizing_investments. It is simple. It is immensely useful.
Now, as to whether those companies will remain solvent long enough, will give you simple enough taxes, and can keep expenses low while rebalancing is another story. You are doing frontier-ish things. It's not as if you have Vanguard or Fidelity offering products like that.
> If there's a security you don't want to own, you can remove it.
Dunno about Vanguard.