Plus, a modern phone with decent performance, especially fast storage, can handle synapse, including rather large rooms. Not as efficient as running a truly lightweight HS embedded with the client, but it makes for a perfect p2p Matrix demo.
(Currently running with dozens of rooms including large ones, on a Snapdragon 888 with plenty ram. The obvious bottleneck is the storage chip.)
No it does not, or at least our comments do not seem to be visible from lemmy.ml, nor do we see any of the remote comments from this instance. We should review project issues since this is probably not implemented yet.
I would add that a reproducible build (or at least a reproducible build of a fork) is publicly available of f-droid, which is more than most can say: https://f-droid.org/en/packages/de.corona.tracing/
If your small webapp is static, or mostly serves static resources, you could offload these to community driven mirrors, or maybe IPFS?