I had been keeping on there my side-project domains, which didn't really need a full gSuite backing them, since only a handful of emails would go in or out per month.
If Migadu's were a more reasonable price, I would have shrugged and upgraded. But going from $0/mo to $29/mo is a stretch.
The 5-domain limit on the Micro plan is also a "soft" limit, and support has implied to me that you could negotiate something that works for you if need be.
Fortunately for me, the new Micro plan works fine, but at this point, I think services like Mailbox.org might provide greater value compared to the upper tiers.
Also, they are currently collaborating with sourcehut to develop a new webmail client to replace RainLoop. For the record, I like RainLoop quite a bit and find it to be very speedy.
So even though I'll barely use it at all I signed up for Migadu only so that I could have a look at the webmail UI. But I couldn't even get a look at it, likely because I have yet to configured my domain. But I will not disrupt my domain just to get a peak at the UI...
Thanks!
Like you mentioned in another comment, it did take me some time to move all my accounts over (about 2 days worth), but I'm so happy I did.