Ok, here's just one reference, there are many others...
"What Percentage of Travel Insurance Claims are Denied?
Contrary to popular belief, the vast majority of Canadian travel insurance claims are paid by insurers, while a relatively small number of claims are declined:
95.3% of travellers had their travel insurance claims paid1, according to a KPMG survey
98% of submitted claims were fully or partially paid2, according to a Pollera Strategic Insights survey
The Pollera survey also found a high rate of satisfaction among individuals who submitted a claim:
91% of respondents who submitted a claim were satisfied with the claims process from start to finish2"
https://www.snowbirdadvisorinsurance.ca/learning-centre/top-5-tips-avoid-having-your-travel-insurance-claim-rejected#:~:text=95.3% of travellers had their,a Pollera Strategic Insights survey