I only took a business law course in high school, but I always was under the impression that any agreement that was illegal was unenforceable, whether it was agreed to or not. Ancestry's little "rule book" would not overrule state or province rule. Since ancestry is operating in another area, it must abide by their rules. I think Elliot Spitzer, NY's attorney General is making quite a career out of these type of ventures, including at least one lawsuit against a company that Tom Stockham was running at the time.
Instead of speculating, someone must be friends with a Canadian lawyer who can set us all straight.