I've been on Fastmail for several years and I've had no spam in my inbox at all. Not a single email. That's a better track record than Gmail for me.

I've been on Fastmail for almost a year, and I get spam/obvious phishing attempts in my inbox. Compared to my experience with GMail before switching to Fastmail, I found Gmail to be noticeably better at spotting and filtering both spam and phishing emails.

Having said that, I'm still not going back to Gmail.

Same experience here. Fastmail is amazing.

I am using Protonmail for some years now. I have maybe one spam mail per week in my inbox, everything else is filtered correctly.

I haven't have any problems with spam on PM, but I also don't give out my email addresses willy-nilly. I have junk emails for that.

What I'm hearing is that PM's spam detection is so poor that you don't feel like you can freely share your PM email address, out of fear that you'll get spammed. That's not a very convincing pitch for their product.