question about HB monthly

No, you don't need to.

No, my PP is only linked to a bank account and I've never had any problem with HB Monthly

I don't have a credit Card and can buy the monthly's just fine

You can either pay using card, or checkout using paypal.

You can always transfer money to your PayPal acc or use a paysafe card, no need to link afaik.

I tried subbing the HB monthly and they wouldn't let me check out with Paypal because I have no CC or bank account linked to it.

I am not sure, but logically they need a source to fund the automatic charging, so a back account of a CC should be linked to paypal for a re-occurring charge.

I do not know the answer to this question, but I do know that you can unsubscribe and resubscribe at any time and paying manually each month is an option instead ....also they recently let you pay for multiple months in one larger payment now (saving a small amount too).