From your project description, you say

The free and open source solution for nesting problem.

but you do not provide a license for the project, making the project "closed source" (at least here in the USA) since there is no indication what license the project falls under.

Additionally, looking at the nest2d.online terms and conditions page, there is the following verbiage:

You must not:

• Republish material from nest2d
• Sell, rent or sub-license material from nest2d
• Reproduce, duplicate or copy material from nest2d
• Redistribute content from nest2d

Which explicitly prohibits reproduction, reuse or resale.

"Open Source" has a generally accepted meaning of being able to use the digital artifacts for commercial purposes. The OSI and Wikipedia's entry on open-source licensing both articulate that commercial re-use is a (generally accepted) requirement of an "open source" license.

The term "free and open source" is especially misleading in your project as this is generally considered to encompass the ideas of "free software" and "open source".

If you mean free as in gratis, then you should say "free of charge". If your intent was to be transparent about your code by publishing it, you should say "source available", not "open source". As stated, this is misleading as someone casually looking at your project would mistake it for a free and open source project that they could reproduce, alter and repackage/resell if they desired.