This came up in a group chat recently and I realized nobody had a good answer. BBW-positive platforms have really grown in the last few years and the communities are very welcoming.
Video calling before a meet is the fastest way to confirm someone is genuinely who they claim to be. OkCupid's free tier is still surprisingly usable compared to what other apps offer for nothing.
Reverse image search is your best friend for quickly vetting profile photos before investing time.