Just checked and then changed our settings today.
https://admin.google.com/ac/apps/gmail/spam?hl=en
Cleared it out, so it looks this nice now. 🙂

Earlier this year, I had three (3) IPs there, all part of an anti-phishing training campaign, where you have to tell Gmail to ignore such emails, else Gmail will absolutely tag them as spam. 🙂
So, NO, having 122 IPs excluded is NOT normal or recommended.
I also recommend telling your vendors to use proper SPF and DKIM, and just let them send from their own domains. I don't want people learning that it's fine to receive emails from external services with spoofed addresses from our domain.
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https://wheretofind.me/@NoSubstitute