Comment by paulddraper

There are self-hosted options for almost everything (e.g. WooCommerce).

EXCEPT payments. (Unless you do crypto, which has been used for purchases by <2% of US adults.)

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And the restrictions are not theoretical.

Most payment providers either outright prohibit (PayPal, CoinBase) or restrict (Stripe) legal gun transactions.

Hateful content is virtually universally banned by processors (see: Gab).