It is certain that closed-end funds can subscribe. However, only someone with a hairstyle can subscribe. At present, no company issues closed-end funds, and even if it does, it can't go out. Closed-end funds in the secondary market are discounted, and no one can buy them at a discount.
The closed-end funds you see now were issued many years ago, and closed-end funds can only be bought and sold in the secondary market.
But now there are some innovative closed-end funds to subscribe to. If you want to buy, pay more attention to the fund market.