[10000truths]

That's just part and parcel of relying on third parties - you should always price in the maintenance burden of keeping up with potential changes on their end. That burden is a lot lower if the third party cooperates with you and provides an explicit contract and backwards compatibility, but it's still not zero.

[Aaargh20318]

It’s not about the maintenance cost, it’s about continuity of service. If you scrape a website things may break at any time. If you use a proper API and have a contract with the supplier you will have the opportunity to make any changes before things break.