Dedicated vs Shared WhatsApp Business API: A GDPR Comparison
Enterprise teams in regulated industries face a binary choice when adopting WhatsApp Business: a dedicated, regional platform they own, or a shared multi-tenant CPaaS where their contacts sit alongside thousands of other brands. The technical and compliance gap between the two is wider than most buyers realise.
TL;DR
- Dedicated platform: single-tenant database, regional data residency (EU-only by default; NA or APAC available), controllable retention, signed DPA covering processing on infrastructure you own. Best for healthcare, finance, public sector, and any GDPR-sensitive workload.
- Shared CPaaS: fast to start, low entry cost, but contact data, message history, and consent records live in a multi-tenant store usually replicated outside the EU. Sub-processor list is long and changes without you.
Side-by-side comparison
| Dimension | Dedicated EU platform | Shared CPaaS |
|---|---|---|
| Tenancy | Single-tenant — your database, your queue, your secrets | Multi-tenant row-level isolation |
| Data residency | EU-WEST only, contractually guaranteed | US + EU replicas; sub-processors in 10+ regions |
| GDPR Article 28 | Processor contract scoped to one controller | Generic processor terms; joint-controller ambiguity |
| DSAR / Right to erasure | Hard delete with signed receipt within hours | Soft delete; backups retained 30–90 days |
| Consent ledger | Append-only audit log, exportable | Vendor-defined, often not exportable |
| Throughput | Your own provider accounts and limits | Shared rate-limit pool; throttling under peak load |
| Encryption keys | Your own database and secrets | Vendor-managed only |
| Number portability | You own the BSP relationship and the number | Number tied to vendor account |
| Audit log | Workspace-level, GDPR audit trail included | Limited to higher tiers, retention capped |
Why GDPR makes this a hard choice
The WhatsApp Business API is operated by Meta, but the controller obligations under GDPR sit with you. A shared CPaaS adds a layer of processing — your contacts' phone numbers, message bodies, and consent state are ingested into the vendor's global data plane before being relayed to Meta. Each replica region and each sub-processor is a new transfer to document, justify with SCCs, and disclose in your privacy notice.
Your own platform collapses that chain. Data lives in one EU region, the processor is one entity, and your DPA scopes the relationship to a single tenant. For Article 30 records, Article 32 security measures, and Article 35 DPIAs, the surface area is small enough to actually defend in front of a supervisory authority.
When shared CPaaS still wins
- You're sending under 10k messages a month and the contacts are not sensitive (e.g. e-commerce shipping notifications).
- You need to launch in days, not weeks, and compliance review can follow.
- You don't yet have a Meta BSP relationship and don't want to negotiate one.
When dedicated is the only viable answer
- Healthcare, banking, insurance, public sector, legal.
- Contacts include special-category data under Article 9.
- Your security team requires customer-managed keys or VPC peering.
- You've had a DSAR or a regulator request that the current vendor couldn't fulfil within the statutory deadline.
- You operate in a market (Germany, France, the Nordics) where buyers ask "where exactly does the data live?" in the first call.
How Arino One delivers this
Arino One gives every customer their own platform and database, in the data region you choose. The inbox, CDP, automations and consent ledger run there — not in a shared pool — on the messaging providers you connect on your own accounts. Erasure requests are handled in Settings → GDPR; the consent log is exportable. See GDPR in Your Platform. The same product surface handles WhatsApp, SMS, voice, and every other channel in one inbox, so you don't trade compliance for capability.
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