Google started editing people's e-mails in GSuite, replacing links with a link through google.com:https://mobile.twitter.com/sneakdotberlin/status/1317734739537653760https://twitter.com/tblodt/status/1317875714981416962?s=20
This means that Google will track a click on a link *in e-mail* even if you're using an external client.
I am *guessing* this is under the pretext of phishing protection, but it actually *creates* additional phishing risk for text-only clients, since now all links are google.com links.