Yes, what phone are you using?
I use Tomato with Libre/miaomiao and an iphone 6s/apple watch combo.
So my knowledge is restricted to those gadgets.
Tomato is still working for me. Not sure when it last auto-updated though...
If anything in my list is similar to yours, then I can have a go at answering questions on what works for me.
Personally, I took one look at Spike, and the need to keep registering, and all that phaff, and steered well clear!
There are a couple of Tomato miaomiao facebook groups you could search for and join - but I didn't get much joy from them.
comments didn't seem very impressed with Tomato performance, and I must say the app isn't very impressive.
HOWEVER I weigh that against the Spike Phaff, and am still happy to keep Tomatoing.
The FB groups seemed to explode with irritation each time there was an update, so that may be your problem? Lots of people having to re-connect their devices, and so on, and lots of comments about how it ceased to work for them until the next update.
Fortunately not something that has affected me - yet - but this is only my 3rd sensor with the miaomiao attached.