Tech Geek Toronto-based Wealthsimple, an online investment management service, raises ~$610M at a post-money valuation of $4B, led by Meritech and GreylockBy Daniel HarrisonMarch 15, 20230 wealthsimple 610m 4b meritech greylocketheringtontechcrunch Toronto-based Wealthsimple, an online investment management service, raises ~$610M at a post-money valuation of $4B,…