JayWS

If it exists for more than 4 hours, 0 minutes are consumed - the 240 minutes are "refunded" to the pot.

Ephemeral keys can still be used to manage long-lived devices when you want them automatically cleaned up if they disappear - they'll just count as tagged nodes when they hit that 241 minute age.

I think the new free tier is going to give you a lot more value, and you can save the $5 :D

No, services are separate. Services are currently soft-limited to 10 on all plans.

Note that if an "Ephemeral Device" exists for more than 4 hours continuously, it consumes 0 minutes, and is billed as a tagged device. The docs are being upgraded to change the language around this.

50 tagged resources is the new limit, but there is no longer any limit on user-owned devices, previously, they were bundled together in that 100 limit.

I'm using Ginger, which works well. Once I used it once, it downloaded the dictionaries, and I could revoke network access.