The BEST Survey/Research study site there is. Unmatched in terms of pay, quality, and respect for your time. I cannot say enough positive things about Prolific. 80% of Mini Money Matters earnings are through Prolific

• Long Waitlist, it took me 8 months to get off the waitlist!
• Take profile setup and ID verification very seriously
• NEVER use public wifi or VPN
• if you aren't seeing surveys due to an IP Whitelist error (often PEC-AB-0004 or PEC-SUB-0002) simply use mobile data on your phone instead of wifi to select and "start survey" - then you can "open study in new window" back on desktop and go from there. Also - unplug your modem overnight so that when you plug it back in the next day, you'll have a new IP from your ISP.
• you can "block" researchers who seem sketchy
• r/ProlificAC is a great community. I recommend lurking there, lol
• Read ALL of the Help page, before reaching out to support or asking people stuff on reddit. it's super detailed and a quick Ctrl+F on each page for your question will get you very far.