GSA and OPT IN PAGES works?

ok it’s clear.

the claim in the site is using a “loophole” or something like this.

I didnt use it. What im askin is: using bit.ly instead of domain url, is a sort of protection
for being penalized?

And if not, how can we protect against anyone who tried to penalize your site?

If it needs only some link-building services to get penalized, wouldnt it be too much easy to throw down a competitor?