

Mailbox.org is a good pick to consider IMO. You can read some comparisons on PrivacyGuides, which I also recommend as a starting point for these sorts of topics. The mailbox.org web UI is not great, but it allows IMAP/SMTP access, so I use Thunderbird on both desktop and Android in order to interact with my inbox. My inbox is auto-encrypted with PGP using their Mailbox Guard thing, so my emails are all encrypted garbage on the web UI anyway. Mailbox.org only allows paid-for accounts, but considering the annoying stuff that Proton and Tuta do to their free accounts I’d rather just be honest about the service I’m getting. It allows auto-forwarding directly in the web UI, but given that you can hook up to it with IMAP anyway, it’s not like you couldn’t just do it yourself.
(Also, as another comment said I also recommend DuckDuckGo’s Email Protection for email aliasing if you need it.)
As a commenter on that post says, this sort of talk is also common in the comments of Phoronix articles. The commenter says they’ve completely stopped supporting Phoronix since it’s clear that Michael enables this behavior by not moderating it (the least he could do is disable commenting; the type of people that are in the Phoronix comments are the absolute worst). It’s been festering for a very long time, unfortunately. Click any Phoronix article that’s older than a day and check the negativity. Worse, click an article about a controversial topic like X11/Wayland/Systemd/bcachefs/KDE/GNOME/etc. and it’s just a shitshow.
I’ve been seeing it to a lesser degree here as well. I don’t know what it is about X11 that really riles up the conspiracy theorists.