In a recent post to the company blog, Google announced its plans to "more closely align" the free version of Gmail and the enterprise version found in subscription-based G Suite. This includes removing ad personalization based on the contents of your emails.
https://www.notebookcheck.net/Google-says-it-will-stop-Gmail-s-scanning-of-email-to-target-ads.230090.0.html
https://www.youtube.com/watch?v=h9JIKngJnCU
I have thunderbird and do not worry.
But reCAPTCHA pissess me! I must 3 times repaet mp3 test!
@ liongmail.se - you might not have adverts in Thunderbird, but is Google still scanning your emails when they reach the server?