It's a system designed to keep the 2 parties in power. Voting third party means your vote is effectively wasted in a FPTP system
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If enough people do it over time I wouldn't think so right?
Each time they would win over and over more seats.
But of course that would require voters to recognize the situation, take the L and keep on continuing voting the third party
In FPTP, not really because voting third party can split the vote between multiple parties meaning that none of them get a relative majority of votes and their common opponent wins instead. The system encourages you to vote for the next closes party that is the most likely to get more votes (strategic voting). It entirely favours a 2 party dynamic
This is a good video explanation that you may have seen before as it is popular