Ann: Notice of FY20 Full Year Results and Key Dates, page-55

You clearly don't understand the technology & the work that went into getting where it is today.
The product is effective against all viruses,bacteria,algae & other microbes.
It is water based, has a long shelf life & non toxic.
Other than making small adjustments for different applications eg hand sanitizer vs surface sanitizer there is no requirement to spend anything significant on R&D.

Zoono products are going to be around for a very long time until if or when a completely different technology emerges.
If that happens then it would be case of a substitute such as what has happened with alcohol sanitizer vs Zoono rather than ZNO changing it's product.

If a technology that came along that made Zoono products redundant it would be like digital cameras & Kodak, it would be game over. Not that i see that happening.