@gjorgji_vasileski Using the API itself is fine, that's what it's there for. The tricky part is consent. A lot of people on the fediverse really don't like their posts being pulled into other platforms without asking, and there's been a fair bit of backlash against projects that did it.
If you go ahead, I'd make it opt-in, or at the very least respect people's "discoverable"/noindex settings and #nobot tags, and make sure deletes and edits carry over. Also worth checking instances rules.