So what is your point exactly? That you shouldn’t charge for software you develop to access a free network? There are plenty of free solutions for you.

A 1 Gbps up/down in Denmark is around 40-50€, and low speeds like 100/100 is more like 25-35€.

Same for Norway and Sweden. Everything is unlimited of course.

One is a rate of data, the other is an amount.

Mbps means megabits per second.

MB is just megabytes. You can of course turn it into a rate, but then it would be MB/s.

There are 8 bits in a byte, so 100 Mbps would be 12.5 MB/s (divide by 8)

This is a problem for any web application. There are many solutions, none are perfect.

On some sites (like 4chan) you’re required to solve a captcha every single time you post, unless you pay a yearly fee not to.

To avoid it, you would need people actively monitoring, banning, and setting up bot detection patterns.

Then again, there are cheap services online where real people are hired to create human accounts and spam you anyway, so…