For 1, 2, and 3, the website owner can choose to block you completely based on IP address or your User Agent. It's not nice, but the best reaction would be to

For 1, 2, and 3, the website owner can choose to block you completely based on IP address or your User Agent. It's not nice, but the best reaction would be to find another website. Perplexity is choosing to come back "on a VPN" with new IP addresses to evade the block. #2 and #3 are about modifying data where access has been granted, I think Cloudflare is really complaining about #1. Evading an IP address ban doesn't violate my principles in some cases, and does in others.