Where EmbedSocial is the better answer
If your requirement is specifically UGC rights management and a workflow around user content, that is closer to their centre of gravity than ours. And if you are already deep into their ecosystem, the cost of switching is real and the gain is incremental.
Switching
Nothing to migrate in the usual sense — reviews live on their source platforms. Reconnect the sources and rebuild the widget. Budget an hour.
Reviews collected from public platforms are not locked to any vendor — they live on Google, Tripadvisor and the rest. Reconnecting them somewhere else is a configuration job, not a migration.