Swissquote CH also allows deposit and withdrawal of BTC and some other cryptos.
I made a deposit in BTC from a regulated exchange for around 20k USD and they wanted to see proof that I was the owner of the account. They asked for a screenshot of a page on the exchange's website showing my personal details. Since my exchange hides personal details for security reasons, I had to request a letter of good standing from my account manager.
For higher amounts you should be prepared to provide more details such as your trading/ledger history, income proof, tax return.
You may also be required to︀ fill out the DDQ-IDA form. (Due Diligence Questionnaire for Investors in Digital Assets). This form︁ asks you about your history/background with crypto, total and origin of fiat you have invested︂ in crypto, description of current holdings, list of brokers/platforms used to acquire/trade/sell/transfer crypto, list your︃ main public addresses, etc. They ask to attach any relevant documents, screenshots, trade/deposit history, to︄ support the responses.