If you only run one TikTok account with ASB TikTok Bot, you do not need to buy a private proxy. You will need to buy a private proxy when using two or more TikTok accounts. ASB does not work with public proxies.
ASB TikTok Bot runs on an emulated platform similar to the TikTok used for Browser. Therefore, your TikTok account(s) will be completely safe. The accounts can only be locked if you do not abide by the rules on TikTok.