I basically just started posting on the first random client I found on Google (iris.to) and ... it works:
https://iris.to/npub14cxhrehjln8r4fqgc8uvatkjv5dlwzxvua2ym93...
No signup, no decision to make which host to use, no nothing. Just save the private key (which iris.to creates for you) and you are good to go forever. The content you post gets relayed everywhere:
https://snort.social/p/npub14cxhrehjln8r4fqgc8uvatkjv5dlwzxv...
So it does not matter if the client you used changes their policies, their algorithm, deplatforms you, goes down or whatever. You can just use any other client and keep posting.
And since the protocol is using websockets, one can write a client in a static html page without any server backend. And it needs surprisingly little code to do so. I really enjoyed this video of a guy writing a Nostr client in a simple html file with like 50 lines of code or so: