2 published complaints: 2 unresolved (2 no response).
Spree grades B on SweepsGuard overall, which puts it above most of the network. The reservation is narrow and specific: 2 published complaints against it, both about mail-in sweepstakes entries, and both closed 2 because the operator did not answer mediation.
We have no published complaint alleging that a straightforward cash redemption went unpaid. Both cases on file concern the alternate mail-in entry route rather than withdrawals, which is a different problem from an operator that does not pay.
Their support desk acknowledges mail within seconds and issues a ticket number, and then nothing further arrives. On the more recent case we were acknowledged inside one minute, heard nothing during the response window, followed up after it closed, and received a second automatic ticket receipt within twenty seconds and no reply. An automated acknowledgment is not a response.
Both published cases describe entries being treated as non-compliant after they were submitted, on a requirement the players say was not stated to them beforehand. A mail-in requirement enforced only after entries arrive is not one a player can meet. If you enter Spree by mail, photograph each envelope and its contents before posting and keep proof of the date, because that documentation is what the dispute turns on.