Full Answer

Building your own pipeline is entirely possible, and that is exactly what makes it a trap. The initial build is the part you can see and scope, so it gets estimated and approved. The part that sinks DIY projects is invisible at the start: the indefinite maintenance that follows.

That maintenance has many sources. Advertising and analytics platforms revise their APIs and deprecate endpoints on their own schedule. Real traffic forces you to handle rate limits with retry logic, monitor for failed events, and alert someone when delivery drops. Warehouse schemas change as your business changes, rippling through downstream queries. Security vulnerabilities need timely patching. Each is manageable alone; together they are a standing obligation.

The economics get worse because data errors are cheap to fix early and expensive to fix late, the pattern often summarised as the 1-10-100 rule, where a problem caught at entry costs a fraction of one caught after decisions depend on it. A DIY pipeline with thin monitoring tends to catch problems late. This is why many self-built pipelines are quietly abandoned once the maintenance outgrows the team's spare capacity. The honest question is not whether you can build it, but whether you want to own its upkeep every week, indefinitely.