Training in parallel on more then one GPU is pretty hard. Distributing the training over many random computers and adding at least some kind of validation, seems to kill the performance. So it would always be easier to rend cloud GPUs.
Not true. Most RxDB users use the dexie.js storage which is for free: https://rxdb.info/rx-storage-dexie.html
Also you should compare it to the alternatives like firestore or AWS datastore which are not even open source partially and cannot even be used with a self-hosted server.
Firebase works until you want a different conflict resolution then last-write-wins.
It is also only offline first if the user is authenticated. Otherwise you need a connection to the servers before using the local state.
This is so dangerous to use. There have been hundrets of these sites in the past. As soon as they have enough traffic they silently redirect or change affiliate ids etc.
Do not use them, the rel=noreferer is good enough.
I am waiting for the time when every "normal" website is so censored and shitty that the average joe is using tor. Then we can create a truly free internet and the cycle starts again. Seems like I have to wait just a few more years.