EncryptedCurse

It's a headache to setup with a create-react-app project. I had to install a lot of dependencies to get it up and running: react-app-rewired, customize-cra, and various Babel plugins to add support for decorators, which required creating .babelrc + config-overrides.js and modifying package.json.
There is no existing, drop-in remote sync backend. The WatermelonDB documentation only mentions two examples, neither of which appear to be well-supported or widely used. You're essentially on your own to implement the backend.

How to Build WatermelonDB Sync Backend in Elixir seems more of an example than a production-ready solution.
Firemelon is built for Firestore — niche.

While both are technically supported, WatermelonDB seems to be more geared towards React Native than React Web. RxDB, on the other hand, explicitly states multiple

	pkg install pulseaudio
	dir=$(pwd)
	if grep -q "anonymous" ~/../usr/etc/pulse/default.pa
	then
	echo "module already present"
	else
	echo "load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1 auth-anonymous=1" >> ~/../usr/etc/pulse/default.pa
	fi
	if grep -q "exit-idle" ~/../usr/etc/pulse/daemon.conf
	then

	sudo su <<EOF
	cd /boot
	cp start_x.elf start_x.elf_backup && \
	perl -pne 's/\x47\xE9362H\x1D\x18/\x47\xE9362H\x1D\x1F/g' < start_x.elf_backup > start_x.elf
	EOF