Yes, you are signing up accounts from public proxies, so is everyone else. Soundcloud shows a captcha if they detect multiple signups from same IP, or if from known proxy countries (china / indonesia / phillipines etc)> I tried using public proxies and it requires me to fill out massive
> amounts of 'manual input' boxes
To avoid this, signup with deathbycaptcha.com for $10 they will solve about 10k captchas for, enter your details on the settings tab