I have every right to censor what content I do or do not want to see. I have every right to mute annoying TV ads, skip them, or walk away from the screen, and with my personal computer and internet service, if I want to use - what could arguably said security-focused - tools like AdBlocker to help prevent my internet connection (be it landline, or the much more usage-sensitive wireless/mobile options) from being bogged down with awful, intrusive, and annoying ads, and secure myself against the ad-space that is regularly exploited by malware and the like, that's my right.
The advertiser has every right to speak, to put their speech out there for all to hear, and to not have to fear government censorship (within certain limits). They do NOT have any right to force me to hear their speech when I don't want to, especially when it is not just on a public street corner somewhere I can choose not to go, but is being piped into my home. Just as I have the right to choose who I let in my front door, I have the right to choose who and what I let in my internet doors. If the hosting site suffers too much and doesn't like it, they can always consider a subscription service, or building their content in a different way, and then I can choose to get my content someplace that exercise some restraint over their advertisers and keep it reasonable.
be able reliably detect and stop the truly determined and capable, any more than police actually stop crime.
"The policy of the American government is to leave their citizens free, neither restraining nor aiding them in their pursuits."
--Thomas Jefferson to M. L'Hommande, 1787
"[...] a wise and frugal Government, which shall restrain men from injuring one another, shall leave them otherwise free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned. This is the sum of good government..."
--Thomas Jefferson, First Inaugural Address, Washington, D.C. March 4, 1801
"[Ours is a] policy of not embarking the public in enterprises better managed by individuals, and which might occupy as much of our time as those political duties for which the public functionaries are particularly instituted."
--Thomas Jefferson to W. C. C. Claiborne, 1808
"Taxes on consumption, like those on capital or income, to be just, must be uniform."
--Thomas Jefferson to Samuel Smith, 1823
"And I sincerely believe, with you, that banking establishments are more dangerous than standing armies; and that the principle of spending money to be paid by posterity, under the name of funding, is but swindling futurity on a large scale."
--Thomas Jefferson to John Taylor, 1816
Life would be so much easier if we could just look at the source code. -- Dave Olson