That's the problem with any commercial product that depends on some online service, though. You always run the risk of the company either deciding they don't want to maintain it any more, going bust or getting borged by someone evil or with different priorities.
Don't think the Ordnance Survey are immune. They might sell out to What3Words or do a deal with Facebook or just decide not to support anything other than the latest IOS or something.
If you get more than 5 years use out of your map license, your subscription-based office suite, your innovative social media product or your smart TV, you're winning.
(This rant sponsored by Autodesk and my late, lamented Nokia E52)