Why should others control my monitor?

If they detect my software and don't let me on their site, that's their prerogative, but my computer is my property, not theirs. If their business model requires them to control other people's computers, plenty of other entrepreneurs will be happy to overtake them in the market.

Once they feel entitled to control my monitor, they start lobbying for laws to support them, making their readers their enemies, trying to force their business plan on others.