Vendor lock-in in AI: the hidden cost of vendor solutions

In brief

• Vendor lock-in is a hidden cost: it doesn't show on an invoice, it accumulates as dependency, postponed migrations and recurring prices.
• Three typical forms in AI: your data at the vendor's, an imposed model, proprietary integrations that only work at his place.
• Exiting gets all the more expensive the longer you stay: that's the logic of a subscription, not of a tool you own.
• The antidote: portable building blocks (PostgreSQL, Cloudflare, interchangeable models), the code at your place, and documented integration points.

The problem, concretely

When you adopt an AI solution from a big vendor, everything seems simple at the start: they integrate, they deploy, it works. The cost, for its part, comes later, in three forms that quotes don't show.

• The data: it lives at the vendor's. Getting it out is an export formatted their way, sometimes incomplete, sometimes blocked by contract.
• The model: you use their model, their settings, their interface. Changing model means changing product.
• The integrations: the connectors are proprietary. Your process runs because everything is in their ecosystem, and only there.

The result: every additional year makes exiting more costly, and recurring prices accumulate without ever owning anything. That's the point leaders discover when they attempt the migration.

The calculation nobody makes

An AI tool at 900 €/month is 32,400 € over 3 years, then 54,000 € over 5 years, owning nothing at the end (see subscription or one-time package). Add the postponed migration: the longer you stay, the more exiting costs. At that point, "staying" is no longer a choice, it's a constraint.

How to avoid lock-in from the start

• The code at your place: delivered, documented, take-over-ready for your team.
• Portable building blocks: PostgreSQL/Supabase, Cloudflare, interchangeable AI models (Mistral, OpenAI, others).
• Documented integration points: we know exactly where each provider connects, therefore where to replace it.
• A one-time cost: you pay to build, not to rent, and operating stays at a few dozen euros a month.

That's exactly the role of an independent integration engineer: deliver the solution and give you back the freedom to choose, rather than keeping you in an ecosystem.