Why is investing in Bitcoin on Robinhood demonized?

I was speaking with someone today about how I'd recently got into investing on the Robinhood app and dropped some money into bitcoin to diversify a bit into crypto. Immediately he went into this lecture about how I didn't really have any bitcoin and how I was just lining the pockets of BlackRock or some other oligarch by investing in Bitcoin on an app instead of owing it myself. And that if I actually was going to own Bitcoin then I would have a wallet or something. I had no idea what he was talking about so when i got home I looked it up and this is Robinhood's response.

"Do I own my own crypto on Robinhood?" -Once you purchase crypto on Robinhood, Robinhood believes you're the legal owner of the crypto. You have all the rights and benefits of ownership, including the rights to appreciation and depreciation of the crypto."

Not educated at all on crypto, or really investing either for that matter as I have just started. But i figured this would be a good place to ask. Could someone please explain? Thanks in advance.