would like to understand if it is legal to develop a bot with Python to have automated Free BTC rolls every 24h.
Captcha purpose is to know you are human. If you using a bot, it is not in accordance with rules.
But aren't there any bans if someone develops a program smart enough to bypass reCaptcha? Although the purpose of reCaptcha is to identify users. But it would be great if someone could design a bot to overcome it. Although FreeBitcoin may look if you use it, it may be related to faucet abuse

It is a bot for automated betting, I think it has nothing to do with using the bot to roll Free BTC automatically every 24 hours