> (claude -p still works on the sub but I get the feeling like if I actually use it, I'll get my Anthropic acct. nuked. Would be great to get some clarity on this. If I invoke it from my Telegram bot, is that an unauthorized 3rd party harness?)

How often? Realistically, if you invoke it occasionally, for what's clearly an amount that's "reasonable personal use", then no you don't get nuked.