The situation is ... complicated. Strict is not enabled by default in private windows. Private Windows are, by default ETP Standard + Tracking Content. ETP Strict includes additional things like Query Parameter Stripping. We made an effort to make ETP strict and Private Windows share the same configuration and to simplify life, but we got blocked on QPS. It's a problem that we should solve separately.
Bug 1841104 Comment 2 Edit History
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The situation is ... complicated. Strict is not enabled by default in private windows. Private Windows are by default ETP Standard + Tracking Content. ETP Strict includes additional things like Query Parameter Stripping. We made an effort to make ETP strict and Private Windows share the same configuration and to simplify life, but we got blocked on QPS. It's a problem that we should solve separately.