Why? EU can just tell an LLM to build an alternative app, they can just tell it to make it user friendly and make no mistakes. That's the primary use case of Trillions of dollars of investment in GPUs and electricity to power them.
JK(or am I?), a protest will be a boon for EU, which is growing Anti-American each and every day. The EU alternatives don't exist not because Europeans can't code but because EU market is open to US companies and there's no reason for duplicate effort as winner takes it all thanks to network effects. EU capital just invests in USA based companies that operate in EU. It's much easier, lower taxes lower worker protection standards etc. Also, US has much more capital to burn to corner the markets, they also just go ahead and buy anything European i.e. Skype. and not risk competition.
This is effectively what we see in China. They only use WeChat, I was unable to register because it says I need someone to verify my account when I try to do it (this has been happening since 2018)