Spaugh got it right on.
Something to add:
You could barter seeds, no sale, no money, no profit, no reporting requirement EVER.
I'v found that only 1/3 barter agreements are held up by the other party (eg. they never send any seeds in return) but that does not matter since IMOE 100% of people who uphold the barter agreement over deliver cause they are the good ones out there. And by bartering I have gotten hold of seeds I could never imagine I would hold.
Simply because some people don't want to so sell super rare seeds they have because another rare seeds in exchange is worth all the effort. Collectomania

The money system is based on our inability to trust each other and a bit of greed.
If we "trusted" each other there wouldn't be any money system.
Within a "trust document" there is nothing sold to "beneficiaries" so that's why you can hand over property to descendants tax free inside a trust document". Yes trust is based on trust and if nothing is sold there can not be a profit also.
Barter is a often a "verbal" or written trust agreement so no money needed and no tax to pay cause there would never be any profit because no sale. And proper trusts are private so no need for any reporting unless you choose too for some strange reason.
But this would only work globally if people where on a moral high peak and contributed willingly to society. Sadly we have the force system now (ATO, IRS ) that indirectly "teaches" people to find cleaver ways to contribute less. The most clever paying the least. Wouldn't it be wonderful if tax heaven accounts had lover initial setup fees and low deposit limits so that the working class could join in on the scheme

Thou shall not scheme against others, anyone??
Opps can't do that! Would be problematic for amazon, starbucks and alphabet inc. cause none would pay tax then and there wouldn't be any free services for them...
Pagnr,
18200 AUD is the no payable tax threshold, anything above that is taxable even if it's from selling cute cat shirts on cafepress. But one can always argue that there is no income from the cute cat shirts, it's all about words, that's' why lawyers talk so damn well!
definition of income:
"The amount of money or its equivalent received during a period of time in exchange for labor or services, from the sale of goods or property, or as profit from financial investments."
It seams more likely to me angry local biz is an escape goat for more taxation schemes from big brother.
You can define the cat shirts as something else then goods or property and your tax free. Just define it properly.
If you buy from a company or sole proprietor that does not meet the 70 000 AUD limit for GST registration then you never pay GST because it is illegal for them to collect it cause they are nor registered.
So for example if I sell seeds annually for less then 70 000 to Australian residents for tax purposes there is no GST for anyone to pay or froward. International sales not included in 70 000 aud threshold only Au residents for tax P.
Kinda makes sense why my.GOV.au does not want small business anymore. GST gallore!
Peace