But talking about bots, so they can bypass the captcha on viabtc?
Yes, they are bypassing the captcha.
Bots solve ViaBTC captcha faster than humans.
I found something weird on ViaBTC free acceleration. I was checking it and found 19 remaining hourly free tx. Out of curiosity, I tried with a pending tx from the mempool; it says submissions are beyond the limit.
ViaBTC hasn't mined any block in the past 9 hours.
I guess they won't accept any new transaction for free acceleration until they mine a new block and include the transactions they have received in the past 9 hours.