Once the pain is big enough, they will be motivated to move to Nostr.

Just like when Blockbuster increased late rental fees, or Youtube started censoring people, Rumble took over. Even Netflix had missteps and now has competitors. It will take time for the network to build. It's all about content, if there is solid content that is exclusive to Nostr, people will flood in. Plus Zaps, when payments are blocked via cashapp or zelle, people will find alternatives and Nostr+BTC is a great one.