Even if you trust Anthropic today (which I don't), they clearly don't want competition and there's no telling what other shady moves they'll pull in future.
The only sustainable way forward is to support open models. I was already on the fence about whether or not to keep my Max subscription (the extra cost over something like DeepSeek V4 didn't really feel justifiable). This is the tipping point for me, I'll be cancelling my sub before it renews at the end of the month.