Id be more concerned about the self selecting nature. There must be quite a limited demographic willing to sign on to Yougov say, and complete surveys for a very small financial reward.
https://en.wikipedia.org/wiki/Opinion_polling_for_the_next_U...
shows that two polls this week, each of ~2000 people, found the Conservatives to have either a 1% or a 12% lead over Labour.
Election polling relies heavily on turnout modeling: it's not enough to know what people's opinions are to predict elections, but also which of those people are likely to vote. And the different polling companies have very different models for that, and other 'artistic' parts of the modeling which aren't strictly related to their polling sample. It certainly doesn't imply problems for survey research as a whole (though, as I said, there are increasingly long-term challenges to the while edifice).