Restream solved one specific problem extremely well: if you want to go live on Twitch and YouTube and TikTok at the same time, and you don't have the upload bandwidth to push three simultaneous streams from your PC, Restream takes one stream from you and fans it out to all three from their cloud. You push 6Mbps once; they handle the rest. For low-bandwidth situations — mobile, IRL on cellular, shared connections, anywhere your upload is constrained — that's a legitimate and valuable service.
The pricing reflects the cloud cost. Restream's paid plans run roughly $16/mo (Standard) to $41/mo (Pro), with enterprise tiers higher. Free tier exists but caps platform count and adds a watermark. Their business is bandwidth — every minute of every paid stream is bandwidth they pay for in their cloud — so the pricing model is structurally tied to your usage in a way that local relay isn't.
Where Restream is genuinely the right answer: you're streaming from a mobile uplink, a hotel, a cafe, or any connection with <20Mbps sustained upload. You don't have the headroom for local relay; cloud fan-out is solving a real problem for you.
Where Restream is the default but not necessarily right: you're streaming from home fiber or fast cable with 30Mbps+ sustained upload, you've never measured your actual bandwidth, and you're paying $15–40/mo for cloud convenience you don't strictly need. This is the bulk of paid Restream subscribers we've talked to — they reached for the default and never reconsidered.