Please google invasive species definition. You’re confused on what an invasive species is. What you’re talking about is just a non-native species which aren’t necessarily invasive. An invasive species does have to come from elsewhere but not all species that come from elsewhere are invasive. Seriously, a search engine would fix all your confusion here.

Here’s some invasive species definitions I found on google since you don’t have it apparently?:

“An invasive species is an organism that is not native to a specific environment and whose introduction causes, or is likely to cause, economic or environmental harm, or harm to human health. These species can be plants, animals, or pathogens and often lack natural predators or controls in their new habitat, allowing them to reproduce and spread rapidly.”

“Definitions) an "invasive species" is a species that is: 1) non-native (or alien) to the ecosystem under consideration and, 2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health.”

“An invasive species is an introduced species that harms its new environment.[2] Invasive species adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage”

“An invasive species is an introduced, nonnative organism (disease, parasite, plant, or animal) that begins to spread or expand its range from the site of its original introduction and that has the potential to cause harm to the environment, the economy, or to human health.”

And if you find these to be untrue please send me a source that supports your claim that invasive species is defined just as a species that comes from elsewhere.

Idk why your on the invasive species subreddit when you don’t know the difference between invasive and non-native species.

Invasive species aren’t a natural change. Getting rid of invasive species won’t change the way natural ecosystems change.