I ran a couple IP address for US-based VPN servers (that you can use via wireguard) and they all came back with various ARIN-COGC Cogent Communications blocks. I hate Cloudflare as much as the next guy, but it doesn't appear that all of the US IP addresses they expose for wireguard connections are upstreamed by Cloudflare. Not that Cogent is likely any better but just wanted to point that out.
Proton uses Cloudflare
The VPN traffic, which sees your real home IP (and packet size and timing), flows through Cloudflare to Proton.
This is an undeniable conflict of interest, because the websites you're hiding from are also on Cloudflare.
In this epic meme slide show "article" with humor, we quickly present the critical facts you need to know,
https://simplifiedprivacy.com/proton-vpn-and-mail-use-cloudflare/outright-negligent-harm.html
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Discussion
That's fair enough, thanks for your time, and each IP will vary. You definitely can go direct and avoid them. But you're connecting to them to get configs, logins, ect to setup these tunnels. Also added notes to the article to focus on email more.
Totally agreed. Just wanted to add some clarification to the details there, and that technically it's possible to connect directly is all.