More detail
There are two different worries here. The everyday one, an outage, is handled by offline-first selling and a removable battery, so a bad network day is not a closed shop.
The longer-term one, relying on a single vendor, is a fair question to ask of any software you adopt. The sensible guard is to keep your records exportable and avoid long lock-in contracts. Veira lets you cancel anytime, so you are never trapped.
Related questions
Will an outage stop my shop?
Am I locked into a long contract?
Veira gives Kenyan shops one calm app for selling, M-Pesa, KRA eTIMS and stock, with a free terminal. Book a demo and see it set up for your trade.