You can never be private with any device that can connect to the internet out of its own volition. Ubiquity, Alta Labs and Mikrotik should never be trusted unless you're OK with your data potentially ending up on their servers.

With that said, you can manually upgrade Mikrotik software and selfhost the Mikrotik CHR, Ubiquity controller and Alta Labs controller for a fee (for the latter), which should then in theory invalidate this argument. Even then, I do not trust non-FOSS software for such critical infrastructure so it's still too much for me, but depending on your risk tolerance this might be a good compromise. I would suggest you to look at Mikrotik seriously - their UI might suck but their hardware and software capabilities are FAR beyond what Ubiquity offers for the same price.

If you want to be private you should get an old computer, buy quad port NIC cards from EBay and run a Linux/BSD router on your own hardware. But that's not the most friendly way to do it so I don't blame anyone for looking away