In the EU, where the market is heavily regulated and favours consumers over entrepreneurs, it could be an offence against Consumer Rights.
Therefore you could be penalised if a consumers organisation finds out and reports to the authorities that you have not included "Terms and Conditions" on your website or that your T&C contains parts that are agains the Civil Code or legal rules (for instance you must allow your customers to file formal complaints about your product or to withdraw the purchase order).
The same is true for information about cookies and privacy. Be very careful as fines could be very severe for a startup or private individual.
https://www.eff.org/wp/clicks-bind-ways-users-agree-online-t...
Most of the EULAs I've seen involved in these sorts of clickthroughs hold the manufacturers blameless, and render lawsuits moot, as they contain an arbitration clause[1].