A headless browser based bot(s) is still going to be rate limited because the limits apply to the entire paid account, so even if it was against their TOS I'm n

A headless browser based bot(s) is still going to be rate limited because the limits apply to the entire paid account, so even if it was against their TOS I'm not really sure how badly it could be abused since you're still throttled to ~50 messages every three or four hours. Maybe they still consider that to be too much traffic though as a continuously running bot is maxing out the potential usage of the account.