I have to solve endless captcha even I do it correctly, from 3 captcha, until 10, and drop to 5, increase to 10 again, and I still logout even I solved all of stupid captcha with successful status.
I have setup 2fa for my account, and captcha still there, even on the first try to login.
After that, I stop paying Dropbox, now moved to Nextcloud using dedicated server, backup to Google Drive and Hetzner, all encrypted.
And keep my account free just to connect to shared folder from my team.