You are right. But here like (upvote) and Instagram like are not same. I have few followers who are upvoting me automatically. If I post multiple times from various other social media into steem, what would happen to their voting power?
Making another account may be another solution
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Yes, it can be a problem for that kind of automatic votes. But generally, when programmed on SteemAuto, you put a limit to how low your Voting Power can go, and after that it stops voting until your Voting Power has recovered, so it shouldn't be a problem (except if they didn't put a limit).