I ended up getting it on FDroid, but why is Thumb Key $20 on the play store?

I had an AA Wireless for a while, but it kept giving me trouble and disconnecting when I upgraded from an S20 to a Fold 4. I bought a Carsify adapter and it's been great ever since

Does NextDNS use a VPN? Unfortunately TailScale and VPNs can't be active at the same time