To elaborate on this a bit:

* You only need two VPNs assuming you just want to protect against either of them linking your browsing history back to your identity and selling that information.

* The second one must be paid for in a reasonably anonymous manner (ex Bitcoin) and only ever accessed via the first VPN in the chain.

* You're fine to pay the first one in a more traditional manner.

* The two providers must be completely unrelated.

* It is highly preferable that the two providers be in different legal jurisdictions (both from each other and yourself).

* This won't protect against a highly motivated criminal investigation.

This reminds me of chaining indials and outdials back in the POTS modem days. Operation Sundevil was certainly a motivated investigation.

Wouldn't that just put all the trust in the last one in the chain?

How would they know where I am?

Don't you have to pay for those VPN ? How do you pay them ?

Mullvad allows you to mail them cash.

Cryptocurrency

Most crypto places force you to provide ID now and governments force you to declare how much you have. Both for tax reasons.

You could mine the crypto yourself, or buy it from someone in person. Bitcoin ATMs verify phone numbers, but if you have a burner phone you could also get BTC from them— they're surprisingly common at gas stations near me