For many old people who got tons of money and aren't too technical then Paypal would be perfect. They would just open their app, buy it on there and just keep it as an investment. Much easier than having to open a Coinbase account or go to a bitcoin ATM. So since they got such a huge audience this is pretty bullish event in my opinion. Just as big as the BTC futures annoucement a few years back.
Using it as a means of purchase is a positive as they have a wide customer base and it connects merchants to consumers of their service. I would however not recommend anyone store their funds on a centralized platform, the risk of; 'not your keys, not your coins' applies in exchanges (CEX) and would also apply in PayPal. Anyone who stores a decentralized currency on a centralized platform undermines the purpose of holding it, and is subject to risk of their funds being seized or their details being sold.
Downloading a Bitcoin wallet for storing your funds is pretty easy, and if the private keys are generated on an air-gapped device it can hold much larger funds, without the need for a hardware wallet (although this is recommended).
This is definitely big news for overall adoption and promotion of Bitcoin and in the long run centralized platforms would contribute to making Bitcoin mainstream, this does not however have to come at the cost of orivace and financial freedom.