To anyone reading this, I hope I can save you some time before you decide to use respondent.io.
This site and service are dead. Do not use it. If you are a participant, or researcher, please do yourself a favor and look elsewhere. Otherwise, you are going to waste your time, and potentially get scammed. Look at the other posts in their own sub who have complained: https://www.reddit[removed by editor]/r/Respondent/comments/r01e25/this_service_is_worthless_and_has_been_abandoned/. It's ridiculous.<br />
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Customer support is extremely rude too, and they will deactivate your account for absolutely no reason (see BBB + other complaints). No professional business does this. I've also left a complaint on the Better Business Bureau, and other subs like r/beermoney to warn others. Upon doing so, I found a lot of similar complaints about their service, and customer support staff. I wish I saw this a long time ago.<br />
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Look at how many unanswered complaints participants and researchers have had (see link): https://www.bbb[removed by editor]/us/ny/brooklyn/profile/market-research/respondent-inc-0121-87134203/complaints<br />
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It looks like they've been defunct/dead since 2020. Use at your own risk.<br />
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Hope this warning helps people, and you are all able to find a more professional and legitimate service.